pgsql: Document permissions needed for pg_database_size and pg_tablespa

Document permissions needed for pg_database_size and pg_tablespace_size.

Back in 8.3, we installed permissions checks in these functions (see
commits 8bc225e7990a and cc26599b7206). But we forgot to document that
anywhere in the user-facing docs; it did get mentioned in the 8.3 release
notes, but nobody's looking at that any more. Per gripe from Suya Huang.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/fb1974cc6b58cd21a269dd7ab8aea0120906ec3b

Modified Files
--------------
doc/src/sgml/func.sgml | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

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