Update sgml release note markup suggestions.

doc/src/sgml/release.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.635 2010/02/17 04:19:37 tgl Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.636 2010/03/20 03:12:52 momjian Exp $ -->
 <!--
 
 Typical markup:
@@ -6,11 +6,12 @@ Typical markup:
 &<>                             use & escapes
 PostgreSQL                      <productname>
 postgresql.conf, pg_hba.conf    <filename>
-[A-Z][A-Z ]+[A-Z]               <command>
+[A-Z][A-Z ]+[A-Z]               <command>, <literal>
 [A-Za-z_][A-Za-z0-9_]+()        <function>
+-[-A-Za-z_]+                    <option>
 [A-Za-z_]/[A-Za-z_]+            <filename>
-pg_[A-Za-z0-9_]                 <application>
-[A-Z][A-Z][A-Z_ ]*              <type>, <envar>, <literal>
+pg_[A-Za-z0-9_]+                <application>, <structname>
+[A-Z][A-Z][A-Z_ ]*              <type>, <varname>, <envar>, <literal>
 
 non-ASCII characters            convert to HTML4 entity (&) escapes