Doc: correct thinko in pg_buffercache documentation.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: e198334034ef683558f857d513ff7f73f7c8c7bd
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2020-02-28T16:29:58Z
Releases: 12.3
Doc: correct thinko in pg_buffercache documentation.

Access to this module is granted to the pg_monitor role, not
pg_read_all_stats.  (Given the view's performance impact,
it seems wise to be restrictive, so I think this was the
correct decision --- and anyway it was clearly intentional.)

Per bug #16279 from Philip Semanchuk.

Discussion: https://postgr.es/m/16279-fcaac33c68aab0ab@postgresql.org

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