docs: versioning docs should show example versioned sidebar files (#9500

)

Co-authored-by: Joshua Chen <sidachen2003@gmail.com>
Co-authored-by: sebastienlorber <lorber.sebastien@gmail.com>

website/docs/guides/docs/versioning.mdx

@@ -145,6 +145,37 @@ versioned_sidebars/version-1.0.0-sidebars.json
 </Tabs>
 ```
 
+:::tip
+
+Versioned sidebar files are, like standard sidebar files, relative to the content root for the given version — so for the example above, your versioned sidebar file may look like:
+
+```json
+{
+  "sidebar": [
+    {
+      "type": "autogenerated",
+      "dirName": "."
+    }
+  ]
+}
+```
+
+or for a manual sidebar:
+
+```json
+{
+  "sidebar": [
+    {
+      "type": "doc",
+      "id": "new",
+      "label": "New"
+    }
+  ]
+}
+```
+
+:::
+
 ### Updating an existing version {#updating-an-existing-version}
 
 You can update multiple docs versions at the same time because each directory in `versioned_docs/` represents specific routes when published.