Fix typo in c62: caelum -> coelum

src/epub/text/chapter-62.xhtml

@@ -19,7 +19,7 @@
 			<p>Now Phineas could hardly explain to Lord Chiltern his objection to the proposed action. A lady was closely concerned, and that lady was Lord Chiltern’s sister. “I certainly shall not,” said Phineas.</p>
 			<p>“And why?”</p>
 			<p>“Just because he wishes me to do it. I should be falling into the little pit that he has dug for me.”</p>
-			<p>“He couldn’t hurt you. What have you got to be afraid of? <span xml:lang="la">Ruat caelum</span>.”</p>
+			<p>“He couldn’t hurt you. What have you got to be afraid of? <span xml:lang="la">Ruat coelum</span>.”</p>
 			<p>“There are certain angels, Chiltern, living up in that heaven which you wish me to pull about our ears, as to whom, if all their heart and all their wishes and all their doings could be known, nothing but praise could be spoken; but who would still be dragged with soiled wings through the dirt if this man were empowered to bring witness after witness into court. My wife would be named. For aught I know, your wife.”</p>
 			<p>“By G⁠⸺, he’d find himself wrong there.”</p>
 			<p>“Leave a chimney-sweep alone when you see him, Chiltern. Should he run against you, then remember that it is one of the necessary penalties of clean linen that it is apt to be soiled.”</p>