Log Message:
-----------
Update error message and documentation for fsync test.
Modified Files:
--------------
pgsql/src/tools/fsync:
README (r1.2 -> r1.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/fsync/README.diff?r1=1.2&r2=1.3)
test_fsync.c (r1.12 -> r1.13)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/fsync/test_fsync.c.diff?r1=1.12&r2=1.13)