9.1alpha1 release notes.

doc/src/sgml/filelist.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/filelist.sgml,v 1.69 2010/06/14 17:25:24 sriggs Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/filelist.sgml,v 1.70 2010/09/02 17:30:06 tgl Exp $ -->
 
 <!entity history    SYSTEM "history.sgml">
 <!entity info       SYSTEM "info.sgml">
@@ -145,6 +145,7 @@
 <!entity keywords   SYSTEM "keywords.sgml">
 
 <!entity release    SYSTEM "release.sgml">
+<!entity release-9.1    SYSTEM "release-9.1.sgml">
 <!entity release-9.0    SYSTEM "release-9.0.sgml">
 <!entity release-8.4    SYSTEM "release-8.4.sgml">
 <!entity release-8.3    SYSTEM "release-8.3.sgml">

doc/src/sgml/release.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.639 2010/08/17 04:37:21 petere Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.640 2010/09/02 17:30:06 tgl Exp $ -->
 <!--
 
 Typical markup:
@@ -72,6 +72,7 @@ can be created without links to the main documentation.  Don't use <xref>.
   The reason for splitting the release notes this way is so that appropriate
   subsets can easily be copied into back branches.
 -->
+&release-9.1;
 &release-9.0;
 &release-8.4;
 &release-8.3;