[AIRFLOW-XXX] Add section on task lifecycle & correct casing in docs #4681
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Description
Here are some details about my PR, including screenshots of any UI changes:
This PR corrects the casing for a few abbreviations and names in the docs: airflow -> Airflow & dag -> DAG.
Added a section in the docs about task lifecycle. I often receive questions about it, and it helps to know what component (scheduler/worker) is responsible for what stage of a task.
Tests
no tests needed
Commits
Documentation
Code Quality
flake8