pgsql: doc: Fix date in EPUB manifest

doc: Fix date in EPUB manifest

If there is no <date> element, the publication date for the EPUB
manifest is taken from the copyright year. But something like
"1996-2013" is not a legal date specification. So the EPUB output
currently fails epubcheck.

Put in a separate <date> element with the current year. Put it in
legal.sgml, because copyright.pl already instructs to update that
manually, so it hopefully won't be missed.

Branch
------
REL9_3_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/0b5a5c8e05e6ebc5923375b056885c6e9934ee31

Modified Files
--------------
doc/src/sgml/legal.sgml | 2 ++
1 file changed, 2 insertions(+)

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