pgsql: Improve documentation about pg_dump's --quote-all-identifiers sw

Improve documentation about pg_dump's --quote-all-identifiers switch.

Per bug #14152 from Alejandro Martínez. Back-patch to all supported
branches.

Discussion: <20160520165824.22598.31426@wrigleys.postgresql.org>

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/960be4a9986d5c4fde585c531e726c85e2aa787a

Modified Files
--------------
doc/src/sgml/ref/pg_dump.sgml | 13 ++++++++++---
doc/src/sgml/ref/pg_dumpall.sgml | 13 ++++++++++---
2 files changed, 20 insertions(+), 6 deletions(-)

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