Log Message:
-----------
Change wording so that you don't need to understand that wal_levels
form a hierarchy. Per Simon's suggestion.
Modified Files:
--------------
pgsql/doc/src/sgml:
config.sgml (r1.275 -> r1.276)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/config.sgml?r1=1.275&r2=1.276)