updated Documentation/ja_JP/SubmittingPatches

Updated Documentaion/ja_JP/SubmittingPatches due to changes from upstream
version(2.6.39) of the file.

And also, this translated SubmittingPatches is already reviewed by JF
project. The JF project is the Japanese equivalent of LDP.
Signed-off-by: Keiichi Kii <k-keiichi@bx.jp.nec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>