doc: remove unnecessary INNER keyword

A join that was added in commit 9b2009c4cf that did not use the INNER
keyword but the existing query used it.  It was cleaner to remove the
existing INNER keyword.

Reported-by: Peter Eisentraut

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

Backpatch-through: 9.5

Branch
------
REL_11_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/42da1db7b9d5dd2d3d2e887adb19c6a3c28804b9

Modified Files
--------------
doc/src/sgml/pgbuffercache.sgml | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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