Add Ubuntu 20.04 distribution link

[chad-ramos]

No description provided.

[opbld30]

Docs Build status updates of commit 4e133c2:

✅ Validation status: passed

File	Status	Preview URL	Details
WSL/install-win10.md	✅Succeeded

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

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[mattwojo]

Thanks for contributing @chad-ramos! :)