Change documentation, change "distributed" checkpoints to "smoothed"

checkpoints.

doc/src/sgml/release.sgml

@@ -1,4 +1,4 @@
-<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.559 2007/12/03 23:49:50 tgl Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.560 2007/12/07 16:53:31 momjian Exp $ -->
 <!--
 
 Typical markup:
@@ -165,7 +165,7 @@ do it for earlier branch release files.
 
     <listitem>
      <para>
-      Distributed checkpoints prevent checkpoint I/O spikes
+      Smoothed checkpoints prevent checkpoint I/O spikes
      </para>
     </listitem>
 
@@ -682,7 +682,7 @@ current_date &lt; 2017-11-17
 
      <listitem>
       <para>
-       Distributed checkpoints prevent checkpoint I/O spikes (Itagaki
+       Smoothed checkpoints prevent checkpoint I/O spikes (Itagaki
        Takahiro and Heikki Linnakangas)
       </para>