Updated documentation for PostgreSQL configuration to reflect changing
from ident to md5.
Added example pg_hba.conf configuration, cleaned up language regarding modification of it, and reordered with examples so as not to be so wordy.
Clarified how to locate the pg_hba.conf.
Small cleanup for example pg_hba.conf documentation change

Signed-off-by: Ken Barber <ken@bob.sh>
Merge branch 'maint/1.3.x/postgresql-manual-pg_hba_conf' into 1.3.x

* maint/1.3.x/postgresql-manual-pg_hba_conf:
  Small cleanup for example pg_hba.conf documentation change
  Clarified how to locate the pg_hba.conf.
  Added example pg_hba.conf configuration, cleaned up language regarding modification of it, and reordered with examples so as not to be so wordy.
  Updated documentation for PostgreSQL configuration to reflect changing from ident to md5.