Correct thinko in last-minute release note item.

The CREATE INDEX CONCURRENTLY bug can only be triggered by row updates,
not inserts, since the problem would arise from an update incorrectly
being made HOT.  Noted by Alvaro.

Author: tglsfdc

doc/src/sgml/release-9.2.sgml

@@ -49,8 +49,8 @@
 
      <para>
       If <command>CREATE INDEX CONCURRENTLY</> was used to build an index
-      that depends on a column not previously indexed, then rows inserted
-      or updated by transactions that ran concurrently with
+      that depends on a column not previously indexed, then rows
+      updated by transactions that ran concurrently with
       the <command>CREATE INDEX</> command could have received incorrect
       index entries.  If you suspect this may have happened, the most
       reliable solution is to rebuild affected indexes after installing