pgsql: Make an editorial pass over the 9.4 release notes.

Make an editorial pass over the 9.4 release notes.

Update the notes to include commits through today, and do a lot of
wordsmithing and markup adjustment. Notably, don't use <link> where <xref>
will do; since we got rid of the text-format HISTORY file, there is no
longer a reason to avoid <xref>.

Branch
------
REL9_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/912c70bb8db05a4a7599e43e3a79599957daa301

Modified Files
--------------
doc/src/sgml/release-9.4.sgml | 1243 +++++++++++++++++++++--------------------
1 file changed, 628 insertions(+), 615 deletions(-)

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