Fix typo

src/epub/text/chapter-1-10.xhtml

@@ -56,7 +56,7 @@
 			<p>“Damn the Common Room!” said <abbr epub:type="z3998:name-title">Mr.</abbr> Prendergast. “What does the Common Room know about rood-screens?”</p>
 			<p>“That’s all right, old boy. We’re all friends here. What you say about rood-screens goes.”</p>
 			<p>“They’ll be questioning the efficacy of infant baptism next. The Church has never countenanced lay opinion on spiritual matters. Now if it were a question of food and drink,” said <abbr epub:type="z3998:name-title">Mr.</abbr> Prendergast, “if it were a question of drink⁠—But not infant baptism. Just drink.” And he sat down.</p>
-			<p>“A sad case, brother,” said Grimes, “truly a sad case. Prendy, do you realize that in two minutes the bell will go for <abbr>Prep.</abbr> and you’re oh duty?”</p>
+			<p>“A sad case, brother,” said Grimes, “truly a sad case. Prendy, do you realize that in two minutes the bell will go for <abbr>Prep.</abbr> and you’re on duty?”</p>
 			<p>“Ding, dong, dell! Pussy’s in the well.”</p>
 			<p>“Prendy, that’s irrelevant.”</p>
 			<p>“I know several songs about bells. Funeral bells, wedding bells, sacring bells, sheep-bells, fire-bells, doorbells, dumbbells and just plain bells.”</p>