pgsql: Further improve documentation about --quote-all-identifiers swit

Further improve documentation about --quote-all-identifiers switch.

Mention it in the Notes section too, per suggestion from David Johnston.

Discussion: <20160520165824.22598.31426@wrigleys.postgresql.org>

Branch
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REL9_3_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/7ac03429418c63eb0b9e8b40c0a20b014ef96f13

Modified Files
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doc/src/sgml/ref/pg_dump.sgml | 3 +++
1 file changed, 3 insertions(+)

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