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>

lib/Kconfig.debug

@@ -822,7 +822,7 @@ config HAVE_DEBUG_STACKOVERFLOW
 config DEBUG_STACKOVERFLOW
 	bool "Check for stack overflows"
 	depends on DEBUG_KERNEL && HAVE_DEBUG_STACKOVERFLOW
-	---help---
+	help
 	  Say Y here if you want to check for overflows of kernel, IRQ
 	  and exception stacks (if your architecture uses them). This
 	  option will show detailed messages if free stack space drops
@@ -1954,7 +1954,7 @@ config ASYNC_RAID6_TEST
 	tristate "Self test for hardware accelerated raid6 recovery"
 	depends on ASYNC_RAID6_RECOV
 	select ASYNC_MEMCPY
-	---help---
+	help
 	  This is a one-shot self test that permutes through the
 	  recovery of all the possible two disk failure scenarios for a
 	  N-disk array.  Recovery is performed with the asynchronous
@@ -2310,7 +2310,7 @@ endif # RUNTIME_TESTING_MENU
 
 config MEMTEST
 	bool "Memtest"
-	---help---
+	help
 	  This option adds a kernel parameter 'memtest', which allows memtest
 	  to be set.
 	        memtest=0, mean disabled; -- default