Log Message:
-----------
Add URLs to two excellent web pages about SSL API and certificate usage.
Modified Files:
--------------
pgsql/doc/src/sgml:
libpq.sgml (r1.252 -> r1.253)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/libpq.sgml?r1=1.252&r2=1.253)
runtime.sgml (r1.401 -> r1.402)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/runtime.sgml?r1=1.401&r2=1.402)