Update outdated Python 2 API reference to reflect Python 3 usage docs

[mdqst]

What was wrong?

I noticed that in the documentation, there was a reference to execfile()d, which is an old Python 2 API that is no longer used in Python 3. In Python 3, the correct approach is to use exec() instead. To ensure the documentation stays up to date and accurate, I’ve updated the comment to reflect the correct usage of exec() in Python 3. This change is important for clarity, as it helps avoid confusion for users working with modern Python versions.

Todo:

• Clean up commit history
• Add or update documentation related to these changes
• Add entry to the release notes

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