doc: Fix titles of some pg_buffercache functions.

As in commit 59d6c03956, use <function> rather than <structname> in
the <title> to be consistent with how other functions in this
module are documented.

Oversights in commits dcf7e1697b and 9ccc049dfe.

Author: Noboru Saito <[email protected]>
Discussion: 
https://postgr.es/m/CAAM3qn%2B7KraFkCyoJCHq6m%3DurxcoHPEPryuyYeg%3DQ0EjJxjdTA%40mail.gmail.com
Backpatch-through: 18

Branch
------
REL_18_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/1412c8ea0740ffe97c154cd63760a214e26c94a8

Modified Files
--------------
doc/src/sgml/pgbuffercache.sgml | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

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