Fix typo

doc/src/sgml/ref/revoke.sgml

 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/ref/revoke.sgml,v 1.11 2000/10/05 19:48:18 momjian Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/ref/revoke.sgml,v 1.12 2000/10/12 21:23:34 momjian Exp $
 Postgres documentation
 -->
 
@@ -375,7 +375,7 @@ REVOKE GRANT OPTION FOR <replaceable class="parameter">privilege</replaceable> [
 
    <para>
     If user1 gives a privilege WITH GRANT OPTION to user2,
-    and user2 gives it to user3, then if user1 tries revoke
+    and user2 gives it to user3, then if user1 tries to revoke
     this privilege it fails if he specify the RESTRICT
     keyword.
    </para>