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
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master

Details
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http://git.postgresql.org/pg/commitdiff/f66faadc4420fdc34f66057f493a0e09c0ad8a58

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

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