Add 'trusting the CA' instructions for WSL2

[chriseikelboom]

Please complete the following:

Link to the page that needs to be updated or changed. https://docs.lando.dev/guides/setup-lando-on-windows-with-wsl-2.html

Describe the change you'd like I would like to know how to add the lando certificates when in a WSL2 environment.

See also: https://docs.lando.dev/config/security.html#trusting-the-ca