docs: cleaned up windows_wsl.md

[Jaskowicz1]

This PR makes windows_wsl.md more explicit to the fact that it uses Ubuntu WSL2. This PR also merges the changes from #820.

• My pull request is made against the dev branch.
• I have ensured that the changed library can be built on your target system. I did not introduce any platform-specific code.
• I have ensured that all methods and functions are fully documented using doxygen style comments.
• I tested my commits, by adding a test case to the unit tests if needed
• I have ensured that I did not break any existing API calls.
• My code follows the coding style guide (if you are not sure, match the code style of existing files including indent style etc).
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[Mishura4]

Don't forget the new line at the end of the file!

[Jaskowicz1]

Don't forget the new line at the end of the file!

That's been fixed and pushed up!