Issue #27991: Remove incorrect sentence about store_true

Patch by py.user.

Doc/howto/argparse.rst

@@ -503,8 +503,8 @@ to count the number of occurrences of a specific optional arguments:
 * Now here's a demonstration of what the "count" action gives. You've probably
   seen this sort of usage before.
 
-* And, just like the "store_true" action, if you don't specify the ``-v`` flag,
-  that flag is considered to have ``None`` value.
+* And if you don't specify the ``-v`` flag, that flag is considered to have
+  ``None`` value.
 
 * As should be expected, specifying the long form of the flag, we should get
   the same output.