Bug 1914435 - Print file paths in mach webidl-example. r=webidl,saschanaz

That way people don't need to read the docs ;)

Differential Revision: https://phabricator.services.mozilla.com/D219899

dom/bindings/mach_commands.py

@@ -28,7 +28,10 @@ def webidl_example(command_context, interface):
 
     manager = create_build_system_manager()
     for i in interface:
-        manager.generate_example_files(i)
+        written = manager.generate_example_files(i)
+        for path_set in written:
+            for path in path_set:
+                print(path)
 
 
 @Command(