doc:  add namespace column to pg_buffercache example query

Without the namespace, the table name could be ambiguous.

Reported-by: [email protected]

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

Backpatch-through: 9.5

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/9b2009c4cfe1450228b941aba52e00e6bb938282

Modified Files
--------------
doc/src/sgml/pgbuffercache.sgml | 31 ++++++++++++++++---------------
1 file changed, 16 insertions(+), 15 deletions(-)

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