Fixes [YOCTO #5857]
I had missed replacing the release date in the manual revision
history tables for the 1.5.1 release. It was still an estimate.
I have replaced with the actual date of "January 2014"
(From yocto-docs rev: fb9abe0df33a9b551d797ac1b72577931f5f8ce6)
Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>