pgsql: Suggest shell here-documents instead of psql -c for multiple com

Suggest shell here-documents instead of psql -c for multiple commands.

The documentation suggested using "echo | psql", but not the often-superior
alternative of a here-document. Also, be more direct about suggesting
that people avoid -c for multiple commands. Per discussion.

Branch
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REL8_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/b0154f20b3bb7c74332f5cbf51baf7ebc68c80b4

Modified Files
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doc/src/sgml/ref/psql-ref.sgml | 20 +++++++++++++++++---
1 file changed, 17 insertions(+), 3 deletions(-)

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