cramfs: Kconfig: fix spelling & punctuation

Fix spelling and hyphenation in cramfs Kconfig.

Link: https://lkml.kernel.org/r/20230124181631.15204-1-rdunlap@infradead.org


Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>