pgsql: Update misleading comment about the use of lanpltrusted ...

Log Message:
-----------
Update misleading comment about the use of lanpltrusted ... it is
significant regardless of the value of lanispl.

Modified Files:
--------------
pgsql/doc/src/sgml:
catalogs.sgml (r2.100 -> r2.101)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/catalogs.sgml.diff?r1=2.100&r2=2.101)