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>

kernel/gcov/Kconfig

@@ -6,7 +6,7 @@ config GCOV_KERNEL
 	depends on DEBUG_FS
 	select CONSTRUCTORS if !UML
 	default n
-	---help---
+	help
 	This option enables gcov-based code profiling (e.g. for code coverage
 	measurements).
 
@@ -42,7 +42,7 @@ config GCOV_PROFILE_ALL
 	depends on GCOV_KERNEL
 	depends on ARCH_HAS_GCOV_PROFILE_ALL
 	default n
-	---help---
+	help
 	This options activates profiling for the entire kernel.
 
 	If unsure, say N.