Docs for magic commands updated

[CyanideByte]

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Describe the changes you have made:

Added the new magic commands to the docs

Reference any relevant issues (e.g. "Fixes #000"):

Pre-Submission Checklist (optional but appreciated):

• [x] I have included relevant documentation updates (stored in /docs)
• [x] I have read docs/CONTRIBUTING.md
• [x] I have read docs/ROADMAP.md

OS Tests (optional but appreciated):

• [x] Tested on Windows
• [ ] Tested on MacOS
• [ ] Tested on Linux

[CyanideByte]

'Magic Commands' and 'Advanced Terminal Usage' have identical contents, but the 'Magic Commands' one isnt shown on the docs sidebar. Not sure if we need both or if 'Advanced Terminal Usage' was meant to have other uses too at some point.

[KillianLucas]

Oh this is way better. Thank you so much @CyanideByte! The TUI is much more powerful than people realize, this pushes that communication much farther. Merging!