Обсуждение: pgsql: Add mention of using tools/fsync to test fsync methods. Restruct

Add mention of using tools/fsync to test fsync methods. Restructure
recent wal_sync_method doc paragraph to be clearer.

Branch
------
REL8_3_STABLE

Details
-------
http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=8a691873252df085544312e0e0ef2d842c457e88

Modified Files
--------------
doc/src/sgml/config.sgml |   12 ++++++------
doc/src/sgml/wal.sgml    |   12 +++++++-----
2 files changed, 13 insertions(+), 11 deletions(-)