Follow PEP-8 guidelines in tutorial for standard library (GH-26127)

(cherry picked from commit 6db2db9)

Co-authored-by: Bob Kline <[email protected]>

Author: miss-islington

Doc/tutorial/stdlib.rst

@@ -78,8 +78,9 @@ and an optional number of lines to be displayed::
 
     import argparse
 
-    parser = argparse.ArgumentParser(prog = 'top',
-        description = 'Show top lines from each file')
+    parser = argparse.ArgumentParser(
+        prog='top',
+        description='Show top lines from each file')
     parser.add_argument('filenames', nargs='+')
     parser.add_argument('-l', '--lines', type=int, default=10)
     args = parser.parse_args()