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

Since commit 84af7a6194e4 ("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>
diff --git a/drivers/gnss/Kconfig b/drivers/gnss/Kconfig
index a0404ce..bd12e3d 100644
--- a/drivers/gnss/Kconfig
+++ b/drivers/gnss/Kconfig
@@ -5,7 +5,7 @@
 
 menuconfig GNSS
 	tristate "GNSS receiver support"
-	---help---
+	help
 	  Say Y here if you have a GNSS receiver (e.g. a GPS receiver).
 
 	  To compile this driver as a module, choose M here: the module will
@@ -32,7 +32,7 @@
 config GNSS_SIRF_SERIAL
 	tristate "SiRFstar GNSS receiver support"
 	depends on SERIAL_DEV_BUS
-	---help---
+	help
 	  Say Y here if you have a SiRFstar-based GNSS receiver which uses a
 	  serial interface.
 
@@ -45,7 +45,7 @@
 	tristate "u-blox GNSS receiver support"
 	depends on SERIAL_DEV_BUS
 	select GNSS_SERIAL
-	---help---
+	help
 	  Say Y here if you have a u-blox GNSS receiver which uses a serial
 	  interface.