fix link (#3726)

Describe what your pull request does. If appropriate, add GIFs or images
showing the before and after.

### Change Type

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- [ ] `sdk` — Changes the tldraw SDK
- [ ] `dotcom` — Changes the tldraw.com web app
- [x] `docs` — Changes to the documentation, examples, or templates.
- [ ] `vs code` — Changes to the vscode plugin
- [ ] `internal` — Does not affect user-facing stuff

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- [x] `bugfix` — Bug fix
- [ ] `feature` — New feature
- [ ] `improvement` — Improving existing features
- [ ] `chore` — Updating dependencies, other boring stuff
- [ ] `galaxy brain` — Architectural changes
- [ ] `tests` — Changes to any test code
- [ ] `tools` — Changes to infrastructure, CI, internal scripts,
debugging tools, etc.
- [ ] `dunno` — I don't know


### Test Plan

1. Add a step-by-step description of how to test your PR here.
2.

- [ ] Unit Tests
- [ ] End to end tests

### Release Notes

- Add a brief release note for your PR here.

Just a small link fix for the docs.

apps/docs/content/docs/editor.mdx

@@ -52,7 +52,7 @@ Each change to the state happens within a transaction. You can batch changes int
 
 ### Listening for changes, and merging changes from other sources
 
-For information about how to synchronize the store with other processes, i.e. how to get data out and put data in, see the (Persistence)[/docs/persistence] page.
+For information about how to synchronize the store with other processes, i.e. how to get data out and put data in, see the [Persistence](/docs/persistence) page.
 
 ### Undo and redo