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>

util-linux/volume_id/squashfs.c

@@ -8,7 +8,6 @@
 
 //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_SQUASHFS) += squashfs.o
 
-//config:
 //config:config FEATURE_VOLUMEID_SQUASHFS
 //config:	bool "SquashFS filesystem"
 //config:	default y
@@ -18,7 +17,6 @@
 //config:	  intended for general read-only filesystem use and in constrained block
 //config:	  device/memory systems (e.g. embedded systems) where low overhead is
 //config:	  needed.
-//config:
 
 #include "volume_id_internal.h"