Fix style in argparse.rst (GH-101733)

(cherry picked from commit 061325e)

Co-authored-by: Marcin Wieczorek <marcin@marcin.co>

Author: miss-islington

Doc/library/argparse.rst

@@ -34,9 +34,9 @@ around an instance of :class:`argparse.ArgumentParser`.  It is a container for
 argument specifications and has options that apply the parser as whole::
 
    parser = argparse.ArgumentParser(
-                       prog = 'ProgramName',
-                       description = 'What the program does',
-                       epilog = 'Text at the bottom of help')
+                       prog='ProgramName',
+                       description='What the program does',
+                       epilog='Text at the bottom of help')
 
 The :meth:`ArgumentParser.add_argument` method attaches individual argument
 specifications to the parser.  It supports positional arguments, options that