fix wrong copy&paste in the helptext for kernel AIO support

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@25772 3c298f89-4303-0410-b956-a3cf2f4a3e73

Config.in

@@ -226,8 +226,6 @@ menu "Global build settings"
 	config KERNEL_AIO
 		bool "Compile the kernel with asynchronous IO support"
 		default n
-		help
-		  This will give you more information in stack traces from kernel oopses
 
 	comment "Package build options"