Update runnable-endpoint docs to use live example instead of image

- Replace Tabs component with actual RunnableEndpoint example
- Follow same format as endpoint-request-snippet documentation
- Use POST /snippets endpoint as the example
- Show both the markdown code and rendered component

Co-Authored-By: [email protected] <[email protected]>

Author: devin-ai-integration[bot]

fern/products/docs/pages/component-library/default-components/runnable-endpoint.mdx

@@ -5,18 +5,15 @@ description: Test API endpoints directly from your documentation with an interac
 
 The `<RunnableEndpoint>` component enables users to make real HTTP requests to your APIs directly in the API Reference. It auto-detects endpoint definitions from your API specification and provides a request builder with inputs for headers, path parameters, query parameters, and request bodies.
 
-<Tabs>
-<Tab title="Example">
-
-![Runnable Endpoint component example](runnable-endpoint.png)
-
-</Tab>
-<Tab title="Markdown">
-````jsx
-<RunnableEndpoint endpoint="GET /api/users/{id}" />
-````
-</Tab>
-</Tabs>
+<CodeBlock title="Markdown">
+  ```jsx
+  <RunnableEndpoint endpoint="POST /snippets" />
+  ```
+</CodeBlock>
+
+will be rendered as: 
+
+<RunnableEndpoint endpoint="POST /snippets" />
 
 ## Features