Fix typo.

robertmhaas · robertmhaas · commit bc9d2e7c4ae1 · 2011-07-27T11:21:05.000-04:00
Noted by Josh Kupershmidt.
diff --git a/doc/src/sgml/ref/comment.sgml b/doc/src/sgml/ref/comment.sgml
@@ -101,7 +101,7 @@ COMMENT ON
       be schema-qualified.
       When commenting on a column,
       <replaceable class="parameter">relation_name</replaceable> must refer
-      to a table, view, or composite types.
+      to a table, view, or composite type.
      </para>
     </listitem>
    </varlistentry>
