docs: update spectrum-ts documentation for v4.1.0

[photon-action-bot]

Documentation Update: spectrum-ts v4.1.0

This PR updates documentation for spectrum-ts based on the v4.1.0 release.

Release Notes

New Features

• read is now a universal content type, so you can call message.read(), space.read(message), or space.send(read(message)) across providers.
• WhatsApp Business now sends real read receipts with markRead, while iMessage keeps its chat-level read behavior. ✨

Improvement

• Slack and Telegram now safely no-op for read receipts, so shared code can call read() without provider-specific branching.
• read() can only target inbound messages, and it can’t be wrapped inside reply() or edit(), which makes misuse fail earlier and more clearly.

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Version: 4.1.0

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[github-actions]

Superseded by #88 which targets a newer version.