Improve 9.0 release notes by removing extra parentheses and linking to a

more appropriate place for exclusion constraints.

doc/src/sgml/ref/create_table.sgml

 <!--
-$PostgreSQL: pgsql/doc/src/sgml/ref/create_table.sgml,v 1.123 2010/02/27 04:29:44 tgl Exp $
+$PostgreSQL: pgsql/doc/src/sgml/ref/create_table.sgml,v 1.124 2010/04/01 00:18:21 momjian Exp $
 PostgreSQL documentation
 -->
 
@@ -455,7 +455,7 @@ CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } ] TABLE <replaceable class="PAR
     </listitem>
    </varlistentry>
 
-   <varlistentry>
+   <varlistentry id="SQL-CREATETABLE-EXCLUDE">
     <term><literal>EXCLUDE [ USING <replaceable class="parameter">index_method</replaceable> ] ( <replaceable class="parameter">exclude_element</replaceable> WITH <replaceable class="parameter">operator</replaceable> [, ... ] ) <replaceable class="parameter">index_parameters</replaceable> [ WHERE ( <replaceable class="parameter">predicate</replaceable> ) ]</literal></term>
     <listitem>
      <para>

doc/src/sgml/release-9.0.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/release-9.0.sgml,v 2.11 2010/03/23 22:37:14 momjian Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/release-9.0.sgml,v 2.12 2010/04/01 00:18:21 momjian Exp $ -->
 
 
  <sect1 id="release-9-0">
@@ -285,7 +285,7 @@
           <listitem>
             <para>
               Allow per-tablespace sequential and random page cost variables
-              (<varname>seq_page_cost</>/(<varname>random_page_cost</>)) via
+              (<varname>seq_page_cost</>/<varname>random_page_cost</>) via
               <link linkend="SQL-ALTERTABLESPACE"><command>ALTER TABLESPACE
               ...  SET/RESET</></link> (Robert Haas)
             </para>
@@ -811,7 +811,7 @@
 
             <para>
               This is enabled with the <link
-              linkend="SQL-CREATETABLE-description"><command>CREATE
+              linkend="SQL-CREATETABLE-EXCLUDE"><command>CREATE
               TABLE CONSTRAINT ...  EXCLUDE</></link> clause.  While
               uniqueness checks could be specified using this syntax,
               the real value of this feature is in using complex