doc: Mention PGDATABASE as supported by pgbench

Michael Paquier <michael@paquier.xyz>

Commit: 9e9b5c05010d25e16e04c8c282a52626650ae233
Author: Michael Paquier <michael@paquier.xyz>
Date: 2021-02-25T07:07:08Z
Releases: 12.7
doc: Mention PGDATABASE as supported by pgbench

PGHOST, PGPORT and PGUSER were already mentioned, but not PGDATABASE.
Like 5aaa584, backpatch down to 12.

Reported-by: Christophe Courtois
Discussion: https://postgr.es/m/161399398648.21711.15387267201764682579@wrigleys.postgresql.org
Backpatch-through: 12

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doc/src/sgml/ref/pgbench.sgml modified +13 −0

Documentation touched

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