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>

net/smc/Kconfig

@@ -2,7 +2,7 @@
 config SMC
 	tristate "SMC socket protocol family"
 	depends on INET && INFINIBAND
-	---help---
+	help
 	  SMC-R provides a "sockets over RDMA" solution making use of
 	  RDMA over Converged Ethernet (RoCE) technology to upgrade
 	  AF_INET TCP connections transparently.
@@ -14,7 +14,7 @@ config SMC
 config SMC_DIAG
 	tristate "SMC: socket monitoring interface"
 	depends on SMC
-	---help---
+	help
 	  Support for SMC socket monitoring interface used by tools such as
 	  smcss.