Incorrect use of indefinite articles in descriptor guide

[InhabitancyCocoon]

Documentation

Thanks for Raymond Hettinger's amazing guide for python descriptors.

In the custom-validators section of the Python 3.13 descriptor guide, the String validator's error message incorrectly uses an as the indefinite article.

The descriptor guide link

As far as I know, this mistake can be traced back to the 3.9 python doc.

Linked PRs

• gh-138295: Fix a grammar issue in error message in custom validator #138296
• [3.14] gh-138295: Fix a grammar issue in the descriptor HOWTO (GH-138296) #138299
• [3.13] gh-138295: Fix a grammar issue in the descriptor HOWTO (GH-138296) #138300

[ZeroIntensity]

3.14 backport will be merged later, thanks!