net: core: Correct function name netevent_unregister_notifier() in the kerneldoc

Fix the following W=1 kernel build warning(s):

net/core/netevent.c:45: warning: expecting prototype for netevent_unregister_notifier(). Prototype was for unregister_netevent_notifier() instead

Reported-by: Hulk Robot <[e-mail]>
Signed-off-by: Xiongfeng Wang <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/core/netevent.c

···
 EXPORT_SYMBOL_GPL(register_netevent_notifier);
 
 /**
- *	netevent_unregister_notifier - unregister a netevent notifier block
+ *	unregister_netevent_notifier - unregister a netevent notifier block
  *	@nb: notifier
  *
  *	Unregister a notifier previously registered by