End-user friendly description of the problem this fixes or functionality that this introduces

• Include this change in the Release Notes. If checked, you must provide an end-user friendly description for your change below

The results in our doc were out-dated, not reflecting our most recent accuracy results: https://www.all-hands.dev/blog/openhands-codeact-21-an-open-state-of-the-art-software-development-agent

This PR updates the docs accordingly.

To run this PR locally, use the following command:

docker run -it --rm   -p 3000:3000   -v /var/run/docker.sock:/var/run/docker.sock   --add-host host.docker.internal:host-gateway   -e SANDBOX_RUNTIME_CONTAINER_IMAGE=docker.all-hands.dev/all-hands-ai/runtime:bc19804-nikolaik   --name openhands-app-bc19804   docker.all-hands.dev/all-hands-ai/openhands:bc19804