Fix example in opus_ubuntu, Add license info
CONTRIBUTOR
CI seems to fail due to languages incorrectly being flagged as invalid, I guess that's related to the currently-broken bcp47 validation (see #4304)
2022-05-24T13:12:40Z
https://github.com/huggingface/datasets/pull/4360#issuecomment-1135907581
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2022-05-24T13:12:40Z
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_The documentation is not available anymore as the PR was closed or merged._
2022-05-31T14:25:24Z
https://github.com/huggingface/datasets/pull/4360#issuecomment-1142207264
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2022-06-01T13:06:07Z
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This PR 
* fixes a typo in the example for the`opus_ubuntu` dataset where it's mistakenly referred to as `ubuntu`
* adds the declared license info for this corpus' origin
* adds an example instance
* updates the data origin type