@Override
	public void showHelp(URL url) {
		if (!isValidHelp) {
			Msg.warn(this, "Help is not in a valid state.  " +
				"This can happen when help has not been built.");
			return;
		}

		Window window = getBestParent(null);
		displayHelp(url, window);
	}
Returns the master help set (the one into which all other help sets are merged).
@return the help set
Ghidra/Framework/Docking/src/main/java/docking/help/HelpManager.java