autofs: Fix typo s/thenew new/the new/ in AUTOFS4_FS description

Fixes: a2225d93 ("autofs: remove left-over autofs4 stubs")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>