powerpc/fadump: update documentation about bootargs_append

JIRA: https://issues.redhat.com/browse/RHEL-52914

commit 9dc1407
Author: Hari Bathini <hbathini@linux.ibm.com>
Date:   Fri May 10 13:51:14 2024 +0530

    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

Signed-off-by: Mamatha Inamdar <minamdar@redhat.com>

Author: Mamatha Inamdar

Documentation/ABI/testing/sysfs-kernel-fadump

@@ -38,3 +38,10 @@ Contact:	linuxppc-dev@lists.ozlabs.org
 Description:	read only
 		Provide information about the amount of memory reserved by
 		FADump to save the crash dump in bytes.
+
+What:		/sys/kernel/fadump/bootargs_append
+Date:		May 2024
+Contact:	linuxppc-dev@lists.ozlabs.org
+Description:	read/write
+		This is a special sysfs file available to setup additional
+		parameters to be passed to capture kernel.