DOC fix documentation error in apache-airflow-providers-fab/access-control.rst

[SuccessMoses]

closes: #43140

[boring-cyborg]

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[SuccessMoses]

Congratulations on your first Pull Request and welcome to the Apache Airflow community!

Thanks boring-cyborg

[potiuk]

I think you have a space missing and Sphix does not like it when formatting tables.

[boring-cyborg]

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