Pathlib docs use `versionadded` incorrectly

[barneygale]

The pathlib documentation uses .. versionadded blocks for new arguments. These should use .. versionchanged.

Linked PRs

• GH-104375: Use versionchanged to describe new arguments in pathlib docs #104376
• [3.12] GH-104375: Use versionchanged to describe new arguments in pathlib docs (GH-104376). #106058

[barneygale]

Fixed in:

• 3.13 / 4a6c84f / GH-104375: Use versionchanged to describe new arguments in pathlib docs #104376
• 3.12 / ef58c04 / [3.12] GH-104375: Use versionchanged to describe new arguments in pathlib docs (GH-104376). #106058