Add wsl2 steps in win 10/11 Pro docs

While following the system set up in my Windows 11 pro machine I found the step of adding wsl2 was needed. So I decided to add it here.

[x] Consistency: check you are following patterns that we already use
- [x] If not, add a PR comment to the new patterns explaining why
[x] Check for correct capitalization of everything
[x] Keep variable names as simple as possible, without leaving out information
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upleveled / system-setup