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/[email protected]
Backpatch-through: 12

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/a6f8dc47a0582e37c234c8e916377b46d2b03817

Modified Files
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doc/src/sgml/ref/pgbench.sgml | 13 +++++++++++++
1 file changed, 13 insertions(+)

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