​Document lock function

[EnterMan123]

Description

No editing can be done after locking

Use case

No response

Anything else?

No response

Are you willing to submit a PR?

• [ ] Yes I'd like to help by submitting a PR!

[affine-issue-bot[bot]]

Issue Status: 🆕 *Untriaged

*🆕 Untriaged

The team has not yet reviewed the issue. We usually do it within one business day. Docs: https://github.com/toeverything/AFFiNE/blob/canary/docs/issue-triaging.md

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