Updates an existing DataHub dataset's metadata. The description and logoName fields can be updated.
Only the fields present in the request body are changed; an omitted field keeps its stored value, and an empty string clears it.
The dataset name is immutable and serves as the resource identifier. To rename a dataset, delete it and create a new one.
If name is included in the request body, it must match the dataset name in the URL path. A mismatched name will be rejected with a 400 error.