Updated poky.ent to use "TBD" for the release date variable.
Updated the mega-manual.sed file to use "2.5.2"
Updated all the <manual>.xml files to include a new entry for
the 2.5.2 release date
Updated poky.ent to have all applicable 2.5.2 variables changed.
(From yocto-docs rev: 189ec469aa8797d75567cfef444b9896d3467e7a)
Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>