chore(docs): add required import of BranchDayOfWeekOperator

[sfirke]

I was following the docs here: https://airflow.apache.org/docs/apache-airflow/stable/_api/airflow/operators/weekday/index.html and adapting those two code blocks. It failed because I didn't import BranchDayOfWeekOperator. So I'm adding it here. Let me know if that does not follow the project's standards.

[boring-cyborg]

Congratulations on your first Pull Request and welcome to the Apache Airflow community! If you have any issues or are unsure about any anything please check our Contributors' Guide (https:/apache/airflow/blob/main/contributing-docs/README.rst)
Here are some useful points:

• Pay attention to the quality of your code (ruff, mypy and type annotations). Our pre-commits will help you with that.
• In case of a new feature add useful documentation (in docstrings or in docs/ directory). Adding a new operator? Check this short guide Consider adding an example DAG that shows how users should use it.
• Consider using Breeze environment for testing locally, it's a heavy docker but it ships with a working Airflow and a lot of integrations.
• Be patient and persistent. It might take some time to get a review or get the final approval from Committers.
• Please follow ASF Code of Conduct for all communication including (but not limited to) comments on Pull Requests, Mailing list and Slack.
• Be sure to read the Airflow Coding style.
• Always keep your Pull Requests rebased, otherwise your build might fail due to changes not related to your commits.
  Apache Airflow is a community-driven project and together we are making it better 🚀.
  In case of doubts contact the developers at:
  Mailing List: [email protected]
  Slack: https://s.apache.org/airflow-slack

[potiuk]

There is a bug added in recent changes that makes this PR fail - let me fix it and I will ask you to rebase it (missing provider)

Also before you rebase - I recommend installing pre-commit - then it will fix the static check issue automaticaly.

[kaxil]

There is a bug added in recent changes that makes this PR fail - let me fix it and I will ask you to rebase it (missing provider)

Also before you rebase - I recommend installing pre-commit - then it will fix the static check issue automaticaly.

It is fixed in #43071 . Once that is merged, please rebase on main and docs should start building again :)

[shahar1]

Rebased and fixed a linting error

[boring-cyborg]

Awesome work, congrats on your first merged pull request! You are invited to check our Issue Tracker for additional contributions.

[sfirke]

Thanks for fixing my linting 🙏 I did this change in the GitHub web UI but will make future contributions using a proper dev environment.