powerpc/fadump: update documentation about bootargs_append

Update ABI documentation about the introduction of the new sysfs
entry bootargs_append. This sysfs entry will be used to setup the
additional parameters to be passed to dump capture kernel.

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240510082114.561163-1-hbathini@linux.ibm.com
This commit is contained in:
Hari Bathini 2024-05-10 13:51:14 +05:30 • committed by Michael Ellerman
commit 9dc1407859