[issue43453] docs: runtime_checkable example refers to changed behavior in 3.10

[Guido van Rossum]

Change by Guido van Rossum <guido at python.org>:


----------
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43453>
_______________________________________