[docs] incomplete sentence in Airflow lineage docs

[jameslamb]

Describe the bug

The documentation at https://datahubproject.io/docs/metadata-ingestion/#using-datahubs-airflow-lineage-backend-recommended contains the following incomplete sentence.

Add the following lines to your airflow.cfg file. You might need to

To Reproduce

I see this at https://datahubproject.io/docs/metadata-ingestion/#using-datahubs-airflow-lineage-backend-recommended and on latest master.

https://github.com/linkedin/datahub/blame/851fe130b162340c56158c91db696cecf4dd12b4/metadata-ingestion/README.md#L1023

Expected behavior

It seems to me that "You might need to..." was supposed to be the start of a suggestion that was accidentally omitted from the docs.

Screenshots

Desktop (please complete the following information):

• OS: macOS Big Sur, 11.4
• Browser: Chrome v91.0.4472.114

Additional context

I'd normally be happy to submit a pull request, but wasn't sure what that sentence was going to be.

Thanks for your time and consideration.