Enable multiple cors url & doc

[GauthierSgds]

Close: #17869

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In case of fundamental code change, Airflow Improvement Proposal (AIP) is needed.
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In case of backwards incompatible changes please leave a note in UPDATING.md.

[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 Contribution Guide (https://github.com/apache/airflow/blob/main/CONTRIBUTING.rst)
Here are some useful points:

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[mik-laj]

Can you add backward compatibility? To do it, you should add mapping to following attribute:

airflow/airflow/configuration.py

Line 135 in eda8a51

deprecated_options = {

[GauthierSgds]

Can you add backward compatibility? To do it, you should add mapping to following attribute:

airflow/airflow/configuration.py

Line 135 in eda8a51

deprecated_options = {

Just added backward, not sure of version (current 2.1.3 or future)

[ashb]

🤞🏻

[github-actions]

The PR most likely needs to run full matrix of tests because it modifies parts of the core of Airflow. However, committers might decide to merge it quickly and take the risk. If they don't merge it quickly - please rebase it to the latest main at your convenience, or amend the last commit of the PR, and push it with --force-with-lease.

[boring-cyborg]

Awesome work, congrats on your first merged pull request!