Docs: Update argparse.rst and add NEWS entry

Author: Krishna-web-hub

Doc/library/argparse.rst

@@ -1690,7 +1690,7 @@ Sub-commands
                      :class:`!ArgumentParser` constructor.
 
       This returned :class:`!ArgumentParser` object can be modified as usual.
-      
+
    Description of parameters:
 
    * *title* - title for the sub-parser group in help output; by default