docs: add cautionary note to emitter.removeAllListeners

Signed-off-by: Fedor Indutny <fedor@indutny.com>

Author: othiym23

doc/api/events.markdown

@@ -69,7 +69,9 @@ Returns emitter, so calls can be chained.
 
 ### emitter.removeAllListeners([event])
 
-Removes all listeners, or those of the specified event.
+Removes all listeners, or those of the specified event. It's not a good idea to
+remove listeners that were added elsewhere in the code, especially when it's on
+an emitter that you didn't create (e.g. sockets or file streams).
 
 Returns emitter, so calls can be chained.