Doc: fix some description of environment variables with frontend tools

Michael Paquier <michael@paquier.xyz>

Commit: 5aaa584f819e2d8d2fb23cdf2174ce6e5628e1f5
Author: Michael Paquier <michael@paquier.xyz>
Date: 2020-03-09T01:53:22Z
Releases: 13.0
Doc: fix some description of environment variables with frontend tools

This addresses a couple of issues in the documentation:
- Description of PG_COLOR was missing for some tools (pg_archivecleanup
and pg_test_fsync), while the other descriptions had grammar mistakes.
- pgbench supports more environment variables: PGUSER, PGHOST and
PGPORT.
- vacuumlo, oid2name and pgbench support coloring (HEAD only)

Author: Michael Paquier
Reviewed-by: Fabien Coelho, Daniel Gustafsson, Juan José Santamaría
Flecha
Discussion: https://postgr.es/m/20200304075418.GJ2593@paquier.xyz
Backpatch-through: 12

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