pgsql: Update 9.4 release notes.

Update 9.4 release notes.

Set release date, do a final pass of wordsmithing, improve some other
new-in-9.4 documentation.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/0923b01e3e64d4985ffbdf8ec912e25ad02e0c0c

Modified Files
--------------
doc/src/sgml/datatype.sgml | 15 +--
doc/src/sgml/plpgsql.sgml | 65 +++++++-----
doc/src/sgml/release-9.4.sgml | 233 +++++++++++++++++------------------------
3 files changed, 143 insertions(+), 170 deletions(-)

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