How to change default tooltip from main menu for wm.url_open.

Archive Python API
1

I used this python script to add an easy way to open the explorer to the menu.
How can I change the default tooltip?
Thank you.

import bpy

def menu_func(self, context):
    '''Open explorer in windows systems'''
    self.layout.operator(
            "wm.url_open", text="Open explorer", icon='FILE_FOLDER').url = "C:/"
def register():
    bpy.types.TOPBAR_MT_help.append(menu_func)

def unregister():
    bpy.types.TOPBAR_MT_help.remove(menu_func)

if __name__ == "__main__":
    register()