[Django] #37129: Cache docs incompletely characterize when culling happens

[Django]

#37129: Cache docs incompletely characterize when culling happens
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Reporter: Jacob Walls | Type:
| Cleanup/optimization
Status: new | Component:
| Documentation
Version: 6.0 | Severity: Normal
Keywords: cache | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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See [https://forum.djangoproject.com/t/django-database-cache-untouched-
expired-entries-are-never-culled-unless-max-entries-is-reached/22679 forum
post]: the cache docs incompletely describe how expired entries are
culled:

> Instead, expired cache entries are culled each time add(), set(), or
touch() is called.

"Each time" neglects the role of `MAX_ENTRIES` here. (You have to exceed
`MAX_ENTRIES` before any culling is done.)
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Ticket URL: <https://code.djangoproject.com/ticket/37129>
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