pgsql: pg_buffercache: document column meanings

pg_buffercache: document column meanings
Improve documentation for usagecount and relforknumber.
Backpatch to 9.3.
Suggestion from Satoshi Nagayasu

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/f71939cd1ac765ba618115f40de4d9c47955a9ef

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

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