[WebAPI] Document PromptAPI: LanguageModel

[jmedley]

Acceptance Criteria

• The listed features are documented sufficiently on MDN
• BCD is updated
• Interactive example and data repos are updated if appropriate
• The content has been reviewed as needed

[jmedley]

Proceeding slowly. I'm a bit out of practice and I assume that your procedures have evolved a bit.

The Prompt API is coming out of Beta in Chrome 148. Since its easier to review smaller PRs, I'm submitting the interfaces one at a time.

And I have other parts of this API queued up: https://github.com/jmedley/content/branches

[hamishwillee]

@jmedley Welcome back. Fortunately procedures have not actually changed that much. The main thing is to get BCD done first so that it is clear that this is already testable and under what conditions (otherwise we just push back that MDN only docs things in a browser). Otherwise most things are the same in Web API since I recall your last post.

FWIW I guess the main thing I'd like to see when there is something to review is links to the spec, explainer, chromestatus, as they provide a good starting point for the reviewer.

[jmedley]

Thanks!

I'm working on the BCD. I'd forgotten about all the spec and explainer stuff.