Big cleanup in config help and description

Redundant help texts (one which only repeats the description)
are deleted.

Descriptions and help texts are trimmed.

Some config options are moved, even across menus.

No config option _names_ are changed.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

init/init.c

@@ -104,13 +104,13 @@
 //config:	  sets TERM to "vt102" if one is found.
 //config:
 //config:config FEATURE_INIT_MODIFY_CMDLINE
-//config:	bool "Modify the command-line to \"init\""
+//config:	bool "Clear init's command line"
 //config:	default y
 //config:	depends on INIT || LINUXRC
 //config:	help
 //config:	  When launched as PID 1 and after parsing its arguments, init
 //config:	  wipes all the arguments but argv[0] and rewrites argv[0] to
-//config:	  contain only "init", so that its command-line appears solely as
+//config:	  contain only "init", so that its command line appears solely as
 //config:	  "init" in tools such as ps.
 //config:	  If this option is set to Y, init will keep its original behavior,
 //config:	  otherwise, all the arguments including argv[0] will be preserved,