pgsql: doc: improve server's keepalive description

doc: improve server's keepalive description

Use superior libpq keepalive description for the server-level
parameters.

Per report by Tatsuo Ishii and Marko Tiikkaja

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/ea43af38dc90d1656e67d7fbdbc809385c380435

Modified Files
--------------
doc/src/sgml/config.sgml | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)

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