cleanup

docs/Basic-Guide.md

 page](Learning-Environment-Executable.md) for instructions on how to build and
 use an executable.
 
-   ```console
-ml-agents$ mlagents-learn config/trainer_config.yaml --run-id=first-run --train
+   ```console ml-agents$ mlagents-learn config/trainer_config.yaml --run-id=first-run --train
 
 
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