fix minor typo in kexec description

Signed-off-by: Zoltan Gyarmati <mr.zoltan.gyarmati@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/kexec/Config.in

@@ -4,7 +4,7 @@ config BR2_PACKAGE_KEXEC
 		BR2_mips || BR2_mips64 || BR2_mipsel || BR2_mips64el || \
 		BR2_powerpc || BR2_sh4 || BR2_sh4a
 	help
-	  Kexec is a user space utiltity for loading another kernel
+	  Kexec is a user space utility for loading another kernel
 	  and asking the currently running kernel to do something with it.
 
 	  https://www.kernel.org/pub/linux/utils/kernel/kexec/