samples: kprobes: add missing MODULE_DESCRIPTION() macros

make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in samples/kprobes/kprobe_example.o
WARNING: modpost: missing MODULE_DESCRIPTION() in samples/kprobes/kretprobe_example.o

Add the missing invocations of the MODULE_DESCRIPTION() macro.

Link: https://lore.kernel.org/all/[e-mail]/

Signed-off-by: Jeff Johnson <[e-mail]>
Signed-off-by: Masami Hiramatsu (Google) <[e-mail]>

samples/kprobes/kprobe_example.c

···
 
 module_init(kprobe_init)
 module_exit(kprobe_exit)
+MODULE_DESCRIPTION("sample kernel module showing the use of kprobes");
 MODULE_LICENSE("GPL");

samples/kprobes/kretprobe_example.c

···
 
 module_init(kretprobe_init)
 module_exit(kretprobe_exit)
+MODULE_DESCRIPTION("sample kernel module showing the use of return probes");
 MODULE_LICENSE("GPL");