code: @Deprecated
  	public static void addDeprecation(String key, String[] newKeys) {
  		addDeprecation(key, newKeys, null);
  	}
docs: Adds the deprecated key to the global deprecation map when no custom
  message is provided.
  It does not override any existing entries in the deprecation map.
  This is to be used only by the developers in order to add deprecation of
  keys, and attempts to call this method after loading resources once,
  would lead to <tt>UnsupportedOperationException</tt>
  
  If a key is deprecated in favor of multiple keys, they are all treated as
  aliases of each other, and setting any one of them resets all the others
  to the new value.
  
  If you have multiple deprecation entries to add, it is more efficient to
  use #addDeprecations(DeprecationDelta[] deltas) instead.
  
  @param key Key that is to be deprecated
  @param newKeys list of keys that take up the values of deprecated key
  @deprecated use {@link #addDeprecation(String key, String newKey)} instead