Fix function name in pg_freespacemap docs. It's "pg_freespace", not

"pg_freespacemap". Reported by hubert depesz lubaczewski.

doc/src/sgml/pgfreespacemap.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/pgfreespacemap.sgml,v 2.3 2008/09/30 10:52:09 heikki Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/pgfreespacemap.sgml,v 2.4 2008/10/02 10:26:51 heikki Exp $ -->
 
 <sect1 id="pgfreespacemap">
  <title>pg_freespacemap</title>
@@ -10,7 +10,7 @@
  <para>
   The <filename>pg_freespacemap</> module provides a means for examining the
   free space map (FSM). It provides a function called
-  <function>pg_freespacemap</function>, or two overloaded functions, to be
+  <function>pg_freespace</function>, or two overloaded functions, to be
   precise. The functions show the value recorded in the free space map for
   a given page, or for all pages in the relation.
  </para>
@@ -26,7 +26,7 @@
   <variablelist>
    <varlistentry>
     <term>
-     <function>pg_freespacemap(rel regclass IN, blkno bigint IN) returns int2</function>
+     <function>pg_freespace(rel regclass IN, blkno bigint IN) returns int2</function>
     </term>
 
     <listitem>
@@ -41,7 +41,7 @@
 
    <varlistentry>
     <term>
-     <function>pg_freespacemap(rel regclass IN, blkno OUT int4, avail OUT int2)</function>
+     <function>pg_freespace(rel regclass IN, blkno OUT int4, avail OUT int2)</function>
     </term>
 
     <listitem>