Doc: remove duplicate poly_ops row from SP-GiST opclass table.

Commit ff963b39 added two identical copies of this row.

Dagfinn Ilmari Mannsåker

Discussion: https://postgr.es/m/d8j8tdevb7x.fsf@dalvik.ping.uio.no

doc/src/sgml/spgist.sgml

@@ -148,24 +148,6 @@
        <literal>|&amp;&gt;</literal>
       </entry>
      </row>
-     <row>
-      <entry><literal>poly_ops</literal></entry>
-      <entry><type>polygon</type></entry>
-      <entry>
-       <literal>&lt;&lt;</literal>
-       <literal>&amp;&lt;</literal>
-       <literal>&amp;&amp;</literal>
-       <literal>&amp;&gt;</literal>
-       <literal>&gt;&gt;</literal>
-       <literal>~=</literal>
-       <literal>@&gt;</literal>
-       <literal>&lt;@</literal>
-       <literal>&amp;&lt;|</literal>
-       <literal>&lt;&lt;|</literal>
-       <literal>|&gt;&gt;</literal>
-       <literal>|&amp;&gt;</literal>
-      </entry>
-     </row>
      <row>
       <entry><literal>text_ops</literal></entry>
       <entry><type>text</type></entry>