Lab 2.3: GitHub source links may become outdated

[tim-schilling]

Location

docs/lab2.md, Lab 2.3 Hints section (lines 348-354)

Issue

The hints section links to specific Django source code on the stable/5.2.x branch:

• https://github.com/django/django/blob/stable/5.2.x/django/db/models/aggregates.py#L168-L173
• https://github.com/django/django/blob/stable/5.2.x/django/db/models/aggregates.py#L26-L37

These links will become outdated as Django releases new versions, and line numbers may shift.

Suggested alternatives

1. Link to stable/main or use a tag that matches the tutorial's supported Django version
2. Link to the Django documentation instead (which is version-aware)
3. Add a note that line numbers may vary by Django version
4. Keep the links but periodically review them when updating the tutorial for new Django releases

The documentation link on line 355 (https://docs.djangoproject.com/en/5.2/ref/models/querysets/#django.db.models.Count.distinct) has the same version-specific issue.