pgsql: psql documentation fixes

psql documentation fixes

Update the documentation for \pset to mention
columns|linestyle|pager_min_lines. Add various mentions of \pset
command equivalences that were previously inconsistent.

Author: Дилян Палаузов <dpa-postgres@aegee.org>

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/5191e357cf22e200a9baaf97bbe8a07ee2537537

Modified Files
--------------
doc/src/sgml/ref/psql-ref.sgml | 30 +++++++++++++++++-------------
src/bin/psql/help.c | 8 +++++---
2 files changed, 22 insertions(+), 16 deletions(-)

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