Re-add module description for ms02-nv to Kconfig

In an unrelated MTD commit, a description about the ms02-nv module
got removed from Kconfig.  While I personally agree with this
removal, the module maintainer (Maciej W. Rozycki) would like to
see it added back.  In the absense of any consistency regarding
Kconfig descriptions his wish should be followed.

Signed-off-by: Martin Michlmayr <tbm@cyrius.com>
Acked-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

drivers/mtd/devices/Kconfig

@@ -47,6 +47,11 @@ config MTD_MS02NV
 	  accelerator.  Say Y here if you have a DECstation 5000/2x0 or a
 	  DECsystem 5900 equipped with such a module.
 
+	  If you want to compile this driver as a module ( = code which can be
+	  inserted in and removed from the running kernel whenever you want),
+	  say M here and read <file:Documentation/modules.txt>.  The module will
+	  be called ms02-nv.o.
+
 config MTD_DATAFLASH
 	tristate "Support for AT45xxx DataFlash"
 	depends on MTD && SPI_MASTER && EXPERIMENTAL