Fix typo:

<   one column or expression indexes, perhaps using per=index statistics
>   one column or expression indexes, perhaps using per-index statistics

Author: bmomjian

doc/TODO

@@ -5,7 +5,7 @@ TODO list for PostgreSQL
 Bracketed items "[]" have more detail.
 
 Current maintainer:	Bruce Momjian (pgman@candle.pha.pa.us)
-Last updated:		Thu Nov  4 22:03:07 EST 2004
+Last updated:		Thu Nov  4 22:11:40 EST 2004
 
 The most recent version of this document can be viewed at the PostgreSQL web
 site, http://www.PostgreSQL.org.
@@ -276,7 +276,7 @@ Indexes
   granularity used for the hash algorithm.
 
 * Allow accurate statistics to be collected on indexes with more than
-  one column or expression indexes, perhaps using per=index statistics
+  one column or expression indexes, perhaps using per-index statistics
 
 * Add fillfactor to control reserved free space during index creation