Add Go examples for message updates, deletes, and appends

[lmars]

Summary

Adds Go code examples to the Updates, deletes and appends docs page, covering all five operations:

• updateMessage — update an existing message by serial
• deleteMessage — soft-delete a message by serial
• appendMessage — incrementally append data to a message (using AppendMessageAsync for non-blocking pipelining)
• getMessage — retrieve the latest version of a message by serial
• getMessageVersions — paginate through the full version history of a message

These operations are now supported in the Go SDK as of ably-go v1.4.0.

Test plan

• Verify Go examples render correctly in the docs site
• Check that code snippets are syntactically valid Go
• Confirm the Go tab appears alongside JavaScript, Node.js, Swift, Java, and Python in each code block

🤖 Generated with Claude Code

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch go-update-delete-append-examples

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