Learning-Environment-Create-New rollerball_config.yaml is missing sequence_length parameter

[gregaton]

https://github.com/Unity-Technologies/ml-agents/blob/release_2_docs/docs/Learning-Environment-Create-New.md#training-the-environment is missing the sequence_length parameter.

mlagents-learn is not able to run the config without it.

[shihzy]

hi @gregaton - thanks for finding. I created a PR for this.
#4023

[chriselion]

This was addressed in #3936 - closing.

[github-actions]

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