staging: iio: accel: Update Kconfig description with module name information

This patch fixes checkpatch.pl warning.
WARNING: please write a paragraph that describes the config symbol fully

Signed-off-by: Tapasweni Pathak <tapaswenipathak@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>