Doc: un-break PDF build.

Oversight in 5c4c7ef: gotta adjust the cell height for removal of
an entry.  Per buildfarm.

Author: tglsfdc

doc/src/sgml/gin.sgml

@@ -126,7 +126,7 @@
       <entry><literal>@@ (jsonb,jsonpath)</literal></entry>
      </row>
      <row>
-      <entry morerows="1" valign="middle"><literal>tsvector_ops</literal></entry>
+      <entry valign="middle"><literal>tsvector_ops</literal></entry>
       <entry><literal>@@ (tsvector,tsquery)</literal></entry>
      </row>
     </tbody>