Log Message:-----------Incorporate examples and doc patches from Mark Kirkwood and David Fetter.
Modified Files:-------------- pgsql/doc/src/sgml: plpgsql.sgml (r1.55 -> r1.56) (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/plpgsql.sgml.diff?r1=1.55&r2=1.56) pgsql/doc/src/sgml/ref: alter_table.sgml (r1.76 -> r1.77) (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/alter_table.sgml.diff?r1=1.76&r2=1.77) create_opclass.sgml (r1.12 -> r1.13) (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_opclass.sgml.diff?r1=1.12&r2=1.13)