Log Message:
-----------
Add documentaiotn mention that constraint names can be sentences that
can convey information to clients on constraint violation.
Modified Files:
--------------
pgsql/doc/src/sgml/ref:
create_table.sgml (r1.96 -> r1.97)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_table.sgml.diff?r1=1.96&r2=1.97)