Fix docstring for removed arg (browser_profile) (#12174)

Fix docstring for removed arg

Author: mdmintz

py/selenium/webdriver/remote/webdriver.py

@@ -284,7 +284,6 @@ def start_session(self, capabilities: dict) -> None:
 
         :Args:
          - capabilities - a capabilities dict to start the session with.
-         - browser_profile - A selenium.webdriver.firefox.firefox_profile.FirefoxProfile object. Only used if Firefox is requested.
         """
 
         caps = _create_caps(capabilities)