Fix longdesc grammar mistake

src/epub/content.opf

@@ -59,7 +59,7 @@
 		<meta id="long-description" property="se:long-description" refines="#description">
 			&lt;p&gt;In Great War era France, &lt;a href="https://standardebooks.org/ebooks/e-e-cummings"&gt;&lt;abbr&gt;E. E.&lt;/abbr&gt; Cummings&lt;/a&gt; is lifted, along with his friend &lt;abbr&gt;B.&lt;/abbr&gt;, from his job as an ambulance driver with the Red Cross, and deposited in a jail in La Ferté Macé as a suspected spy. There his life consists of strolls in the &lt;i lang="fr"&gt;cour&lt;/i&gt;, &lt;i lang="fr"&gt;la soupe&lt;/i&gt;, and his mattress in The Enormous Room, the male prisoners’ communal cell. It’s these prisoners who Cummings describes in lurid detail.&lt;/p&gt;
 			&lt;p&gt;&lt;i&gt;The Enormous Room&lt;/i&gt; is far from a straightforward autobiographical diary. Cummings’ descriptions, peppered liberally with colloquial French, avoid time and, for the most part, place, and instead focus on the personal aspects of his internment, especially in the almost-metaphysical description of the most otherworldy of his compatriots: The Delectable Mountains.&lt;/p&gt;
-			&lt;p&gt;During his imprisonment, Cumming’s father petitioned the &lt;abbr&gt;U.S.&lt;/abbr&gt; and French authorities for his liberty. This, and his eventual return home, are described in the book’s introduction.&lt;/p&gt;
+			&lt;p&gt;During his imprisonment, Cummings’ father petitioned the &lt;abbr&gt;U.S.&lt;/abbr&gt; and French authorities for his liberty. This, and his eventual return home, are described in the book’s introduction.&lt;/p&gt;
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 		<dc:language>en-US</dc:language>
 		<dc:source>https://www.gutenberg.org/ebooks/8446</dc:source>