fix broken links

Author: ethanpalm

api-playground/openapi-setup.mdx

@@ -105,7 +105,7 @@ The metadata for the generated pages will have the following default values:
 - `deprecated`: The `deprecated` field from the OpenAPI operation, if present. If true, a deprecated label will appear next to the endpoint title in the side navigation and on the endpoint page.
 
 <Tip>
-  If you have some endpoints in your OpenAPI schema that you want to exclude from your auto-populated API pages, add the [`x-hidden`](/api-playground/openapi/advanced-features#x-hidden) property to the endpoint.
+  If you have some endpoints in your OpenAPI schema that you want to exclude from your auto-populated API pages, add the [`x-hidden`](/api-playground/customization/managing-page-visibility#x-hidden) property to the endpoint.
 </Tip>
 
 ### Example with tabs

api-playground/overview.mdx

@@ -109,7 +109,7 @@ When you need more control over your API documentation, create individual `MDX`
 - Hide specific operations
 - Reorder pages in your navigation
 
-See [MDX Setup](/api-playground/mdx-setup) for more information on creating individual pages for your API endpoints.
+See [MDX Setup](/api-playground/mdx/configuration.mdx) for more information on creating individual pages for your API endpoints.
 
 ## Further reading
 

integrations/sdks/stainless.mdx

@@ -26,6 +26,6 @@ description: Automate SDK example snippets in your API playground
    />
   </Step>
   <Step title="Add your OpenAPI spec URL to your `docs.json`.">
-    In your `docs.json` file, add the URL from Stainless to the `openapi` field. See [OpenAPI Setup](/api-playground/openapi/setup) for more information.
+    In your `docs.json` file, add the URL from Stainless to the `openapi` field. See [OpenAPI Setup](/api-playground/openapi-setup) for more information.
   </Step>
 </Steps>