Log Message:
-----------
Document problem with NULL SSL ciphers and man-in-the-middle attacks.
Modified Files:
--------------
pgsql/doc/src/sgml:
runtime.sgml (r1.397 -> r1.398)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/runtime.sgml?r1=1.397&r2=1.398)