Remove reference to python 2 in section 2 of language ref

[paulehoffman]

Documentation

The description of identifier names is based on how those names were handled in Python 2.0. The description should instead be only for Python 3.

Linked PRs

• gh-125461: Remove Python 2 from identifiers in doc #125462
• [3.13] gh-125461: Remove Python 2 from identifiers in doc (GH-125462) #125464
• [3.12] gh-125461: Remove Python 2 from identifiers in doc (GH-125462) #125465

[picnixz]

Closing since this was completed and backported. Thanks for the contribution!