Add some help texts to recently-introduced kconfig items

Signed-off-by: Jan Engelhardt <jengelh@gmx.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (edited MACINTOSH_DRIVERS per Geert Uytterhoeven's remark)
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/crypto/Kconfig

@@ -2,6 +2,11 @@
 menuconfig CRYPTO_HW
 	bool "Hardware crypto devices"
 	default y
+	---help---
+	  Say Y here to get to see options for hardware crypto devices and
+	  processors. This option alone does not add any kernel code.
+
+	  If you say N, all options in this submenu will be skipped and disabled.
 
 if CRYPTO_HW