Log Message:
-----------
Add markup for new constraint_name mention.
Modified Files:
--------------
pgsql/doc/src/sgml/ref:
create_table.sgml (r1.97 -> r1.98)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_table.sgml.diff?r1=1.97&r2=1.98)