Remove one copy of duplicated alpha4 release note.

Noted by Andy Colson

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/c0f2b2e256a3e98c2a066cee8623b7ab156b7f9c

Modified Files
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doc/src/sgml/release-9.1.sgml |   12 ------------
1 files changed, 0 insertions(+), 12 deletions(-)

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