Update 10-docker.md

Addresses woodpecker-ci#4366

docs/docs/30-administration/22-backends/10-docker.md

@@ -18,10 +18,6 @@ FROM woodpeckerci/woodpecker-server:latest-alpine
 RUN apk add -U --no-cache docker-credential-ecr-login
 ```
 
-## Podman support
-
-While the agent was developed with Docker/Moby, Podman can also be used by setting the environment variable `DOCKER_HOST` to point to the Podman socket. In order to work without workarounds, Podman 4.0 (or above) is required.
-
 ## Image cleanup
 
 The agent **will not** automatically remove images from the host. This task should be managed by the host system. For example, you can use a cron job to periodically do clean-up tasks for the CI runner.