nodebug repo feedback

[Bruno Wolff III]

On Fri, Nov 16, 2012 at 15:25:36 -0500,
   Josh Boyer <jwboyer at redhat.com> wrote:
>
>No, no objections at all!  Thanks.

I added a caveats section and added an entry stating:
Will not "just work" with secure boot. (Because these kernels are built as scratch builds in koji, they don't get to run on the signing builders, so they don't get signed, so the shim will not run them without human interaction.)