Update <hgroup> children after first <h#> to <p>, ref. new HTML standard

src/epub/text/chapter-1.xhtml

@@ -9,7 +9,7 @@
 		<section id="chapter-1" epub:type="chapter">
 			<hgroup>
 				<h2 epub:type="ordinal z3998:roman">I</h2>
-				<h3 epub:type="title">In Which We Are Introduced to Winnie-the-Pooh and Some Bees, and the Stories Begin</h3>
+				<p epub:type="title">In Which We Are Introduced to Winnie-the-Pooh and Some Bees, and the Stories Begin</p>
 			</hgroup>
 			<p>Here is Edward Bear, coming downstairs now, bump, bump, bump, on the back of his head, behind Christopher Robin. It is, as far as he knows, the only way of coming downstairs, but sometimes he feels that there really is another way, if only he could stop bumping for a moment and think of it. And then he feels that perhaps there isn’t. Anyhow, here he is at the bottom, and ready to be introduced to you. Winnie-the-Pooh.</p>
 			<p>When I first heard his name, I said, just as you are going to say, “But I thought he was a boy?”</p>

src/epub/text/chapter-10.xhtml

@@ -9,7 +9,7 @@
 		<section id="chapter-10" epub:type="chapter">
 			<hgroup>
 				<h2 epub:type="ordinal z3998:roman">X</h2>
-				<h3 epub:type="title">In Which Christopher Robin Gives Pooh a Party, and We Say Goodbye</h3>
+				<p epub:type="title">In Which Christopher Robin Gives Pooh a Party, and We Say Goodbye</p>
 			</hgroup>
 			<p>One day when the sun had come back over the Forest, bringing with it the scent of May, and all the streams of the Forest were tinkling happily to find themselves their own pretty shape again, and the little pools lay dreaming of the life they had seen and the big things they had done, and in the warmth and quiet of the Forest the cuckoo was trying over his voice carefully and listening to see if he liked it, and wood-pigeons were complaining gently to themselves in their lazy comfortable way that it was the other fellow’s fault, but it didn’t matter very much; on such a day as this Christopher Robin whistled in a special way he had, and Owl came flying out of the Hundred Acre Wood to see what was wanted.</p>
 			<p>“Owl,” said Christopher Robin, “I am going to give a party.”</p>

src/epub/text/chapter-2.xhtml

@@ -9,7 +9,7 @@
 		<section id="chapter-2" epub:type="chapter">
 			<hgroup>
 				<h2 epub:type="ordinal z3998:roman">II</h2>
-				<h3 epub:type="title">In Which Pooh Goes Visiting and Gets Into a Tight Place</h3>
+				<p epub:type="title">In Which Pooh Goes Visiting and Gets Into a Tight Place</p>
 			</hgroup>
 			<p>Edward Bear, known to his friends as Winnie-the-Pooh, or Pooh for short, was walking through the forest one day, humming proudly to himself. He had made up a little hum that very morning, as he was doing his Stoutness Exercises in front of the glass: <em>Tra-la-la, tra-la-la</em>, as he stretched up as high as he could go, and then <em>Tra-la-la, tra-la⁠—oh, help!⁠—la</em>, as he tried to reach his toes. After breakfast he had said it over and over to himself until he had learnt it off by heart, and now he was humming it right through, properly. It went like this:</p>
 			<blockquote epub:type="z3998:song">

src/epub/text/chapter-3.xhtml

@@ -9,7 +9,7 @@
 		<section id="chapter-3" epub:type="chapter">
 			<hgroup>
 				<h2 epub:type="ordinal z3998:roman">III</h2>
-				<h3 epub:type="title">In Which Pooh and Piglet Go Hunting and Nearly Catch a Woozle</h3>
+				<p epub:type="title">In Which Pooh and Piglet Go Hunting and Nearly Catch a Woozle</p>
 			</hgroup>
 			<p>The Piglet lived in a very grand house in the middle of a beech-tree, and the beech-tree was in the middle of the forest, and the Piglet lived in the middle of the house. Next to his house was a piece of broken board which had: “<b>Trespassers W</b>” on it. When Christopher Robin asked the Piglet what it meant, he said it was his grandfather’s name, and had been in the family for a long time, Christopher Robin said you <em>couldn’t</em> be called Trespassers W, and Piglet said yes, you could, because his grandfather was, and it was short for Trespassers Will, which was short for Trespassers William. And his grandfather had had two names in case he lost one⁠—Trespassers after an uncle, and William after Trespassers.</p>
 			<p>“I’ve got two names,” said Christopher Robin carelessly.</p>

src/epub/text/chapter-4.xhtml

@@ -9,7 +9,7 @@
 		<section id="chapter-4" epub:type="chapter">
 			<hgroup>
 				<h2 epub:type="ordinal z3998:roman">IV</h2>
-				<h3 epub:type="title">In Which Eeyore Loses a Tail and Pooh Finds One</h3>
+				<p epub:type="title">In Which Eeyore Loses a Tail and Pooh Finds One</p>
 			</hgroup>
 			<p>The Old Grey Donkey, Eeyore, stood by himself in a thistly corner of the forest, his front feet well apart, his head on one side, and thought about things. Sometimes he thought sadly to himself, “Why?” and sometimes he thought, “Wherefore?” and sometimes he thought, “Inasmuch as which?”⁠—and sometimes he didn’t quite know what he <em>was</em> thinking about. So when Winnie-the-Pooh came stumping along, Eeyore was very glad to be able to stop thinking for a little, in order to say “How do you do?” in a gloomy manner to him.</p>
 			<p>“And how are you?” said Winnie-the-Pooh.</p>

src/epub/text/chapter-5.xhtml

@@ -9,7 +9,7 @@
 		<section id="chapter-5" epub:type="chapter">
 			<hgroup>
 				<h2 epub:type="ordinal z3998:roman">V</h2>
-				<h3 epub:type="title">In Which Piglet Meets a Heffalump</h3>
+				<p epub:type="title">In Which Piglet Meets a Heffalump</p>
 			</hgroup>
 			<p>One day, when Christopher Robin and Winnie-the-Pooh and Piglet were all talking together, Christopher Robin finished the mouthful he was eating and said carelessly: “I saw a Heffalump today, Piglet.”</p>
 			<p>“What was it doing?” asked Piglet.</p>

src/epub/text/chapter-6.xhtml

@@ -9,7 +9,7 @@
 		<section id="chapter-6" epub:type="chapter">
 			<hgroup>
 				<h2 epub:type="ordinal z3998:roman">VI</h2>
-				<h3 epub:type="title">In Which Eeyore Has a Birthday and Gets Two Presents</h3>
+				<p epub:type="title">In Which Eeyore Has a Birthday and Gets Two Presents</p>
 			</hgroup>
 			<p>Eeyore, the old grey Donkey, stood by the side of the stream, and looked at himself in the water.</p>
 			<p>“Pathetic,” he said. “That’s what it is. Pathetic.”</p>

src/epub/text/chapter-7.xhtml

@@ -9,7 +9,7 @@
 		<section id="chapter-7" epub:type="chapter">
 			<hgroup>
 				<h2 epub:type="ordinal z3998:roman">VII</h2>
-				<h3 epub:type="title">In Which Kanga and Baby Roo Come to the Forest, and Piglet Has a Bath</h3>
+				<p epub:type="title">In Which Kanga and Baby Roo Come to the Forest, and Piglet Has a Bath</p>
 			</hgroup>
 			<p>Nobody seemed to know where they came from, but there they were in the Forest: Kanga and Baby Roo. When Pooh asked Christopher Robin, “How did they come here?” Christopher Robin said, “In the Usual Way, if you know what I mean, Pooh,” and Pooh, who didn’t, said “Oh!” Then he nodded his head twice and said, “In the Usual Way. Ah!” Then he went to call upon his friend Piglet to see what <em>he</em> thought about it. And at Piglet’s house he found Rabbit. So they all talked about it together.</p>
 			<p>“What I don’t like about it is this,” said Rabbit. “Here are we⁠—you, Pooh, and you, Piglet, and Me⁠—and suddenly⁠—”</p>

src/epub/text/chapter-8.xhtml

@@ -9,7 +9,7 @@
 		<section id="chapter-8" epub:type="chapter">
 			<hgroup>
 				<h2 epub:type="ordinal z3998:roman">VIII</h2>
-				<h3 epub:type="title">In Which Christopher Robin Leads an Expotition to the North Pole</h3>
+				<p epub:type="title">In Which Christopher Robin Leads an Expotition to the North Pole</p>
 			</hgroup>
 			<p>One fine day Pooh had stumped up to the top of the Forest to see if his friend Christopher Robin was interested in Bears at all. At breakfast that morning (a simple meal of marmalade spread lightly over a honeycomb or two) he had suddenly thought of a new song. It began like this:</p>
 			<blockquote epub:type="z3998:song">

src/epub/text/chapter-9.xhtml

@@ -9,7 +9,7 @@
 		<section id="chapter-9" epub:type="chapter">
 			<hgroup>
 				<h2 epub:type="ordinal z3998:roman">IX</h2>
-				<h3 epub:type="title">In Which Piglet Is Entirely Surrounded by Water</h3>
+				<p epub:type="title">In Which Piglet Is Entirely Surrounded by Water</p>
 			</hgroup>
 			<p>It rained and it rained and it rained. Piglet told himself that never in all his life, and <em>he</em> was goodness knows <em>how</em> old⁠—three, was it, or four?⁠—never had he seen so much rain. Days and days and days.</p>
 			<p>“If only,” he thought, as he looked out of the window, “I had been in Pooh’s house, or Christopher Robin’s house, or Rabbit’s house when it began to rain, then I should have had Company all this time, instead of being here all alone, with nothing to do except wonder when it will stop.” And he imagined himself with Pooh, saying, “Did you ever see such rain, Pooh?” and Pooh saying, “Isn’t it <em>awful</em>, Piglet?” and Piglet saying, “I wonder how it is over Christopher Robin’s way” and Pooh saying, “I should think poor old Rabbit is about flooded out by this time.” It would have been jolly to talk like this, and really, it wasn’t much good having anything exciting like floods, if you couldn’t share them with somebody.</p>