Adding a new entry to 10.0R errata

[Steven Hartland]

Hi guys I've just been tripped up by an issue with the 10-RELEASE
which causes a panic and hang when patching LSI firmware on mps.

This is already fixed in 10/stable by mav. Having spoken to him
he agrees that its likely worth mentioning in the 10.0R errata.

So the question is how do we go about doing that?

For reference the following two revisions are required:-
http://svnweb.freebsd.org/base?view=revision&revision=262553
http://svnweb.freebsd.org/base?view=revision&revision=262575

    Regards
    Steve