Add visual customization section to documentation (#33133)

Release Notes:

- Improved settings documentation for [visual customization](https://zed.dev/docs/visual-customization/)

docs/src/workspace-persistence.md

@@ -12,3 +12,20 @@ The naming convention of these databases takes on the form of `0-<zed_channel>`:
 - Preview: `0-preview`
 
 **If you encounter workspace persistence issues in Zed, deleting the database and restarting Zed often resolves the problem, as the database may have been corrupted at some point.** If your issue continues after restarting Zed and regenerating a new database, please [file an issue](https://github.com/zed-industries/zed/issues/new?template=10_bug_report.yml).
+
+## Settings
+
+You can customize workspace restoration behavior with the following settings:
+
+```json
+{
+  // Workspace restoration behavior.
+  //   All workspaces ("last_session"), last workspace ("last_workspace") or "none"
+  "restore_on_startup": "last_session",
+  // Whether to attempt to restore previous file's state when opening it again.
+  // E.g. for editors, selections, folds and scroll positions are restored
+  "restore_on_file_reopen": true,
+  // Whether to automatically close files that have been deleted on disk.
+  "close_on_file_delete": false
+}
+```