Introduce a MDX validation error

Author: mdlinville

models/launch/evaluate-hosted-model.mdx

@@ -45,7 +45,7 @@ This example job runs the `simpleqa` benchmark against the OpenAI model `o4-mini
 ![Example hosted model evaluation job](/images/models/llm-evaluation-jobs/hosted-model-job-example.pn)
 </Frame>
 
-This example leaderboard visualizes the performance of several OpenAI models together:
+This example leaderboard visualizes the performance of several OpenAI models together: {}
 
 <Frame>
 ![Example leaderboard visualizing the performance of several hosted models](/images/models/llm-evaluation-jobs/hosted-model-leaderboard-example.png)