[issue26095] Update porting HOWTO to special-case Python 2 code, not Python 3

[Roundup Robot]

Roundup Robot added the comment:

New changeset a2bf6d1e018e by Brett Cannon in branch 'default':
Merge for issue #26095
https://hg.python.org/cpython/rev/a2bf6d1e018e

----------
nosy: +python-dev

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26095>
_______________________________________