[AIT-304] feat: Mutable messages ably-java

[ttypic]

Description

Add Mutable messages ably-java

Checklist

• Commits have been rebased.
• Linting has been run against the changed file(s).
• The PR adheres to the writing style guide and contribution guide.

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[Copilot]

Pull request overview

Adds Ably Java documentation for mutable (updatable/deletable/appendable) messages across the “Updates & deletes” guide and the REST/Realtime Channels API reference.

Changes:

• Adds Java code examples to the updating/deleting/appending and retrieval sections in updates-deletes.mdx.
• Extends REST and Realtime Channels API reference docs with Java method signatures for mutable-message APIs.
• Fixes a corrupted Node.js example line in REST Channels docs.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 14 comments.

File	Description
src/pages/docs/messages/updates-deletes.mdx	Adds Java usage examples for update/delete/append and message retrieval/version APIs.
src/pages/docs/api/rest-sdk/channels.mdx	Adds Java signatures/sections for mutable message APIs and fixes a Node.js snippet typo.
src/pages/docs/api/realtime-sdk/channels.mdx	Adds Java signatures/sections for mutable message APIs in Realtime Channel docs.

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[sacOO7]

Suggested change

	<If lang="java">
	<If lang="java,kotlin">

If kotlin snippet is same as java, then we can share them right?

[ttypic]

let's do in other PR, kotlin syntax a bit different