md: revise Kconfig help for MD_MULTIPATH
md: revise Kconfig help for MD_MULTIPATH

Make it clear in the config message that MD_MULTIPATH is not under
active development.

Cc: Oren Held <40216ef269b78cff043793db1b448c1e14049638@il.ibm.com>
Signed-off-by: NeilBrown <1c00aa603bb92d594c03cff60ecf8e63b2a5bcb1@suse.de>

KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas