[Skiboot] [PATCH v2] README.md: Update reference to linux SubmittingPatches

[Stewart Smith]

Cyril Bur <cyril.bur at au1.ibm.com> writes:
> The wise linux gods went an moved the content. May as well point to the
> actual content.
>
> Signed-off-by: Cyril Bur <cyril.bur at au1.ibm.com>
> ---
> Joel suggested the web address, this is a good idea.

Yep, great idea. Merged to master as of 0d8fb9b489f5a7f6840ed7edcc1c8c7d65b79dd2

-- 
Stewart Smith
OPAL Architect, IBM.