docs(realtimekit): updated api reference as per latest core sdk

[ravindra-cloudflare]

Summary

Core SDK reference were not updated for a long time and went out of sync. Updating the SDK reference.

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[cloudflare-docs-bot]

Review

⚠️ 1 warning found in commit 4d5d7ee.

Fix in your agent

Fix the following review findings in PR #32158 (https://github.com/cloudflare/cloudflare-docs/pull/32158).

Before making changes, review each finding and present a brief summary table:
- For each finding, state whether you agree, disagree, or need clarification
- If you disagree (e.g. the fix requires disproportionate effort for minimal benefit,
  or the finding is factually incorrect), explain why
- If you need clarification before deciding, ask those questions
- Then share your plan for which issues to tackle and in what order

After triaging, fix all legitimate findings. For any you decide to skip,
post a comment on this PR with the finding ID and your reasoning.

---

## Code Review

### Warnings (1)

#### CR-47a9bee826db · Misleading variable name in code example
- **File:** `src/content/docs/realtime/realtimekit/core/api-reference/RTKParticipant.md` line 17
- **Issue:** `participant4` is assigned the result of `.filter()`, which returns an array of participants, but the singular variable name implies a single `RTKParticipant` instance.
- **Fix:** Rename the variable to a plural name such as `johnParticipants`, or use `.find((p) => p.name === 'John')` if the intent is to show selecting a single participant.

Code Review

This code review is in beta and may not always be helpful — use your judgment.

Warnings (1)

File	Issue
realtime/realtimekit/core/api-reference/RTKParticipant.md line 17	Misleading variable name in code example — participant4 is assigned the result of .filter(), which returns an array of participants, but the singular variable name implies a single RTKParticipant instance. Fix: Rename the variable to a plural name such as johnParticipants, or use .find((p) => p.name === 'John') if the intent is to show selecting a single participant.

Conventions

_{No convention issues found.}

Style Guide Review

_{No style-guide issues found.}

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/realtime/	@cloudflare/product-owners, @cloudflare/realtime, @cloudflare/RealtimeKit, @roerohan, @ravindra-cloudflare

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