Log Message:
-----------
Clean up description of 9.0's incompatible changes in SIMILAR TO and
SQL-style substring().
Modified Files:
--------------
pgsql/doc/src/sgml:
release-9.0.sgml (r2.14 -> r2.15)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/release-9.0.sgml?r1=2.14&r2=2.15)