Document singleton pattern changes in customfields handler.

[paulholden]

See MDL-88176.

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[Copilot]

Pull request overview

Documents the change in Moodle 5.2 that moves \core_customfield\handler::create(...) static caching/reset behavior into the base handler, and updates the Custom fields API docs accordingly.

Changes:

• Added a Moodle 5.2 developer update entry describing the base handler create() caching/reset change (MDL-88176).
• Updated Custom fields API documentation (current + 5.2) to reflect the base handler’s create() behavior.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
versioned_docs/version-5.2/devupdate.md	Adds a 5.2 dev update note about the base customfields handler create() caching/reset change.
versioned_docs/version-5.2/apis/core/customfields/index.md	Updates the 5.2 Custom fields API docs to describe the base handler create() behavior.
docs/apis/core/customfields/index.md	Updates the current Custom fields API docs to describe the base handler create() behavior.

[yerairogo]

I think we should avoid calling singleton to the handler class to avoid future misconceptions. Otherwise, looks good.
Please address Copilot comments so I can approve it :)

[paulholden]

I think we should avoid calling singleton to the handler class to avoid future misconceptions. Otherwise, looks good. Please address Copilot comments so I can approve it :)

Cheers Yerai, applied all Copilot suggestings and also changed the devupdate heading:

Custom fields base handler caching {/* #custom-fields-base-handler-caching */}

[yerairogo]

Thanks Paul. Looks good to me 👍

[aanabit]

Merging this PR based on Yerai's review.