The update fixes a copy-paste-and-forget-to-update-everything error
in the documentation of the `SRC_URI` entry in the Reference Manual.
The `maxdate` paragraph just repeated what is there for the
neighboring `mindate` paragraph which was incorrect.
(From yocto-docs rev: fdf0a0e2e0bd0852208d08e5661a04d25c04feef)
Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>