docs/manual: refresh informations about *-menuconfig targets

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

docs/manual/make-tips.txt

@@ -32,10 +32,12 @@ The result of the search shows the help message of the matching items.
 Not all targets are always available,
 some settings in the +.config+ file may hide some targets:
 
+* +busybox-menuconfig+ and +busybox-savedefconfig+ ony work when
+  +busybox+ is enabled;
 * +linux-menuconfig+ and +linux-savedefconfig+ only work when
   +linux+ is enabled;
-* +uclibc-menuconfig+ is only available when the
-  Buildroot internal toolchain backend is used;
+* +uclibc-menuconfig+ is only available when the uClibc C library is
+  selected in the internal toolchain backend;
 * +barebox-menuconfig+ and +barebox-savedefconfig+ only work when the
   +barebox+ bootloader is enabled.