Clarify recommended debug workflow in Quickstart documentation

[adenbad]

Documentation

While reviewing the Quickstart documentation, I noticed that debug mode is discussed but the distinction between using app.run(debug=True) and the recommended flask run --debug CLI flag is not clearly emphasized.

The Quickstart explains how to enable debug mode, but it does not clearly distinguish:

• When app.run(debug=True) should be used
• That flask run --debug is the modern recommended development workflow
• Why separating debug configuration from application code is considered best practice

Because many external tutorials still reference app.run(debug=True), new users may be uncertain about which approach is preferred in current Flask versions.

I suggest adding a brief clarification in the Quickstart section noting that flask run --debug is the recommended development workflow, along with a short explanation of the distinction between the two approaches.

[brianschubert]

I think you meant to open this on the flask tracker? It looks like you're talking about an issue with this page: https://flask.palletsprojects.com/en/stable/quickstart/#debug-mode

This is the tracker for Python itself (i.e. these docs https://docs.python.org/3/)