doc:  update bgwriter description

This clarifies exactly what the bgwriter does, which should help with
tuning.

Reported-by: Chris Wilson

Discussion: 
https://postgr.es/m/[email protected]

Backpatch-through: 9.5

Branch
------
REL9_5_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/a39de0c415fa6f0e215c97e4d587aaa6482174ca

Modified Files
--------------
doc/src/sgml/config.sgml | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

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