samples: kprobes: Fixes a typo

Fixes typo in a function name.

Link: https://lore.kernel.org/all/20230817170819.77857-1-atulpant.linux@gmail.com/Signed-off-by: Atul Kumar Pant <atulpant.linux@gmail.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

samples/kprobes/kretprobe_example.c

@@ -35,7 +35,7 @@ struct my_data {
 	ktime_t entry_stamp;
 };
 
-/* Here we use the entry_hanlder to timestamp function entry */
+/* Here we use the entry_handler to timestamp function entry */
 static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
 {
 	struct my_data *data;