[PATCH v3] Documentation: kdump: update kdump guide

[Jonathan Corbet]

Baoquan He <bhe at redhat.com> writes:

> Some parts of the guide are aged, hence need be updated.
>
> 1) The backup area of the 1st 640K on X86_64 has been removed
>    by below commits, update the description accordingly.
>
>    commit 7c321eb2b843 ("x86/kdump: Remove the backup region handling")
>    commit 6f599d84231f ("x86/kdump: Always reserve the low 1M when the crashkernel option is specified")
>
> 2) Sort out the descripiton of "crashkernel syntax" part.
>
> 3) And some other minor cleanups.
>
> Signed-off-by: Baoquan He <bhe at redhat.com>

Applied, thanks.

jon