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>
diff --git a/coreutils/dd.c b/coreutils/dd.c
index 3d1ba2e..5e68087 100644
--- a/coreutils/dd.c
+++ b/coreutils/dd.c
@@ -41,7 +41,7 @@
 //config:	default y
 //config:	depends on DD
 //config:	help
-//config:	  Enables support for writing a certain number of bytes in and out,
+//config:	  Enable support for writing a certain number of bytes in and out,
 //config:	  at a time, and performing conversions on the data stream.
 //config:
 //config:config FEATURE_DD_STATUS
@@ -49,7 +49,7 @@
 //config:	default y
 //config:	depends on DD
 //config:	help
-//config:	  Enables support for status=noxfer/none option.
+//config:	  Enable support for status=noxfer/none option.
 
 //applet:IF_DD(APPLET_NOEXEC(dd, dd, BB_DIR_BIN, BB_SUID_DROP, dd))