[py] fix return type and docstring of get_downloadable_files (SeleniumHQ#15292)

Author: Delta456

py/selenium/webdriver/remote/webdriver.py

@@ -1381,9 +1381,8 @@ def set_user_verified(self, verified: bool) -> None:
         """
         self.execute(Command.SET_USER_VERIFIED, {"authenticatorId": self._authenticator_id, "isUserVerified": verified})
 
-    def get_downloadable_files(self) -> dict:
-        """Retrieves the downloadable files as a map of file names and their
-        corresponding URLs.
+    def get_downloadable_files(self) -> list:
+        """Retrieves the downloadable files as a list of file names.
 
         Example:
         --------

py/test/selenium/webdriver/remote/remote_downloads_tests.py

@@ -28,6 +28,7 @@ def test_get_downloadable_files(driver, pages):
 
     assert "file_1.txt" in file_names
     assert "file_2.jpg" in file_names
+    assert type(file_names) is list
 
 
 def test_download_file(driver, pages):