Log Message:
-----------
Update admin guide's discussion of WAL to match present reality.
Modified Files:
--------------
pgsql-server/doc/src/sgml:
backup.sgml (r2.45 -> r2.46)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/backup.sgml.diff?r1=2.45&r2=2.46)
wal.sgml (r1.28 -> r1.29)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/wal.sgml.diff?r1=1.28&r2=1.29)