[issue38972] Link to instructions to change PowerShell execution policy for venv activation

Brett Cannon added the comment: And where this has come up as an issue: https://github.com/microsoft/vscode-python/issues/2559. -- ___ Python tracker ___

[issue38972] Link to instructions to change PowerShell execution policy for venv activation

New submission from Brett Cannon : It would probably be good to add a note in the venv docs about execution policies, why it needs to change for environment activation, and how to do it -- especially now that we sign Activate.ps1 -- so there's less of a chance of people being caught