powerpc/mm/hash: Fix off-by-one in comment about kernel contexts ids

[Michael Ellerman]

On Fri, 2017-04-28 at 12:05:23 UTC, Michael Ellerman wrote:
> Michal Suchánek noticed a comment in book3s/64/mmu-hash.h about the context ids
> we use for the kernel was inconsistent with the code and other comments in the
> same file.
> 
> It should read 1-4 not 1-5.
> 
> While we're touching it, update "address" to "addresses" which makes more sense
> as it's referring to more than one address below.
> 
> Reported-by: Michal Suchánek <msuchanek at suse.de>
> Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>

Applied to powerpc next.

https://git.kernel.org/powerpc/c/add2e1e585875b42ac745c05bf0e7f

cheers