manual/make-tips.txt: fix typo

Signed-off-by: Jerzy Grzegorek <jerzy.grzegorek@trzebnica.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

docs/manual/make-tips.txt

@@ -32,7 +32,7 @@ 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-menuconfig+ and +busybox-savedefconfig+ only work when
   +busybox+ is enabled;
 * +linux-menuconfig+ and +linux-savedefconfig+ only work when
   +linux+ is enabled;