argparse: remove incoherent and redundant docstring for private method (GH-101591)

Signed-off-by: FeRD (Frank Dana) <ferdnyc@gmail.com>

Author: ferdnyc

Lib/argparse.py

@@ -698,14 +698,6 @@ class ArgumentDefaultsHelpFormatter(HelpFormatter):
     """
 
     def _get_help_string(self, action):
-        """
-        Add the default value to the option help message.
-
-        ArgumentDefaultsHelpFormatter and BooleanOptionalAction when it isn't
-        already present. This code will do that, detecting cornercases to
-        prevent duplicates or cases where it wouldn't make sense to the end
-        user.
-        """
         help = action.help
         if help is None:
             help = ''