documentation/bsp-guide/bsp.xml: qualified the commit ID difference

In the example that shows the linux-yocto_3.0.bbappend file the
commit IDs are pretty much random and taken at the time I wrote
the section.  I have provided a qualifying statement before the
example to explain that the commit ID strings in the manual's
example could differ from those in the actual file in the YP
source repository.

(From yocto-docs rev: f31278a7ebc4271a6cb75da6891d2d9bf82d41f3)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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