docs: remove spurious quotation mark
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		@ -145,7 +145,7 @@
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 * <title>A #GtkDialog UI definition fragment.</title>
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 * <programlisting><![CDATA[
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 * <object class="GtkDialog" id="dialog1">
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 *   <child internal-child="vbox">"
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 *   <child internal-child="vbox">
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 *     <object class="GtkVBox" id="vbox">
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 *       <child internal-child="action_area">
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 *         <object class="GtkHButtonBox" id="button_box">
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