Typo in lesson 06-python-environments: "upgrade globally" should be "downgrade globally"

[thony-p]

In phases/00-setup-and-tooling/06-python-environments/docs/en.md, the "Problem" section says:

You install PyTorch 2.4 for a fine-tuning project. Next week, a different project needs PyTorch 2.1 because its CUDA build is pinned. You upgrade globally, and the first project breaks. You downgrade, and the second one breaks.

Since the scenario starts with PyTorch 2.4 installed and the new project needs 2.1, the first action should be a downgrade, not an upgrade. The sentence should read:

You downgrade globally, and the first project breaks. You upgrade back, and the second one breaks.