A bit of cleanup after SSL patch. Add it to config file, improve

doc/src/sgml/client-auth.sgml

doc/src/sgml/installation.sgml

doc/src/sgml/runtime.sgml

src/backend/postmaster/postmaster.c

src/backend/utils/misc/guc.c

src/bin/psql/startup.c

src/include/miscadmin.h