Add a forgotten -v option to the build-finish docs

This was overlooked when copy-pasting the option
docs from build-init (which is the only command where
-v is not the short option for --verbose).

doc/xdg-app-build-finish.xml

@@ -78,6 +78,7 @@
             </varlistentry>
 
             <varlistentry>
+                <term><option>-v</option></term>
                 <term><option>--verbose</option></term>
 
                 <listitem><para>