pgsql: Docs: document that psql's "\i -" means read from stdin.

Docs: document that psql's "\i -" means read from stdin.

This has worked that way for a long time, maybe always, but you would
not have known it from the documentation. Also back-patch the notes
I added to HEAD earlier today about behavior of the "-f -" switch,
which likewise have been valid for many releases.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/7bd149ce2aa6af8910604eb45cc202798f563781

Modified Files
--------------
doc/src/sgml/ref/psql-ref.sgml | 7 +++++++
1 file changed, 7 insertions(+)

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