Update documentation on FreeBSD write cache control.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/4869d10afc74e9cc774942c24b48cef301a0a693

Modified Files
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doc/src/sgml/wal.sgml |    5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)

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