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
------
REL9_3_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/6cafc4fb09bc3bc56365c5f76f1ceba11ec86088

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

--
Sent via pgsql-committers mailing list (pgsql-committers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-committers