Add warning for AWS Bedrock

Author: dirkbrnd

models/aws-bedrock.mdx

@@ -12,6 +12,10 @@ We recommend experimenting to find the best-suited model for your use-case. Here
 - You can play with Amazon Nova models. Use `amazon.nova-pro-v1:0` for general purpose tasks.
 - For Claude models, see our [Claude integration](/models/aws-claude).
 
+<Warning>
+Async usage of AWS Bedrock is not yet supported. When using `AwsBedrock` with an `Agent`, you can only use `agent.run` and `agent.print_response`. 
+</Warning>
+
 ## Authentication
 
 Set your `AWS_ACCESS_KEY_ID`, `AWS_SECRET_ACCESS_KEY` and `AWS_REGION` environment variables.