treewide: replace '---help---' in Kconfig files with 'help'

Since commit 84af7a6194 ("checkpatch: kconfig: prefer 'help' over
'---help---'"), the number of '---help---' has been gradually
decreasing, but there are still more than 2400 instances.

This commit finishes the conversion. While I touched the lines,
I also fixed the indentation.

There are a variety of indentation styles found.

  a) 4 spaces + '---help---'
  b) 7 spaces + '---help---'
  c) 8 spaces + '---help---'
  d) 1 space + 1 tab + '---help---'
  e) 1 tab + '---help---'    (correct indentation)
  f) 1 tab + 1 space + '---help---'
  g) 1 tab + 2 spaces + '---help---'

In order to convert all of them to 1 tab + 'help', I ran the
following commend:

  $ find . -name 'Kconfig*' | xargs sed -i 's/^[[:space:]]*---help---/\thelp/'

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

drivers/net/wireless/admtek/Kconfig

@@ -2,7 +2,7 @@
 config WLAN_VENDOR_ADMTEK
 	bool "ADMtek devices"
 	default y
-	---help---
+	help
 	  If you have a wireless card belonging to this class, say Y.
 
 	  Note that the answer to this question doesn't directly affect the
@@ -17,7 +17,7 @@ config ADM8211
 	depends on MAC80211 && PCI
 	select CRC32
 	select EEPROM_93CX6
-	---help---
+	help
 	  This driver is for ADM8211A, ADM8211B, and ADM8211C based cards.
 	  These are PCI/mini-PCI/Cardbus 802.11b chips found in cards such as: