coreutils: adjust applet descriptions

Only mention busybox applets for the meta package and do not imply that
applets are enabled for any possible coreutils program.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

utils/coreutils/Makefile

@@ -57,9 +57,9 @@ define Package/coreutils
 endef
 
 define Package/coreutils/description
- Full versions of standard GNU utilities. Normally, you would not use this
- package, since the functionality in BusyBox is more than sufficient and
- smaller.
+ Full versions of standard GNU utilities. If an equivalent Busybox applet is
+ available, you should consider compiling that instead as Busybox applets are
+ usually smaller, at the expense of reduced functionality.
 endef
 
 define GenPlugin
@@ -70,8 +70,7 @@ define GenPlugin
  endef
 
  define Package/$(1)/description
-  Full version of standard GNU $(2) utility. Normally, you would not use this
-  package, since the functionality in BusyBox is more than sufficient.
+  Full version of standard GNU $(2) utility.
  endef
 endef