Fix typos

doc/src/sgml/config.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.97 2006/11/25 22:44:48 petere Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.98 2006/11/30 20:50:44 petere Exp $ -->
 
 <chapter Id="runtime-config">
   <title>Server Configuration</title>
@@ -39,7 +39,7 @@
     (milliseconds), <literal>s</literal> (seconds),
     <literal>min</literal> (minutes), <literal>h</literal> (hours),
     and <literal>d</literal> (days).  Note that the multiplier for
-    memory units in 1024, not 1000.
+    memory units is 1024, not 1000.
    </para>
 
    <para>

doc/src/sgml/gin.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/gin.sgml,v 2.5 2006/11/23 05:58:01 neilc Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/gin.sgml,v 2.6 2006/11/30 20:50:44 petere Exp $ -->
 
 <chapter id="GIN">
 <title>GIN Indexes</title>
@@ -184,7 +184,7 @@
  <para>
   <acronym>GIN</acronym> doesn't support full index scans due to their
   extreme inefficiency: because there are often many keys per value,
-  each heap pointer will returned several times.
+  each heap pointer will be returned several times.
  </para>
 
  <para>