Documentation: VirusCheck feature wording is misleading

### Checklist

- [X] I have verified this is the correct repository for opening this issue.
- [X] I have verified no other issues exist related to my request.

### Is Your Feature Request Related To A Problem? Please describe.

The current explanation of the VirusCheck feature is very sparse and a little misleading:

https://github.com/chocolatey/choco/blob/b6dbc3e0b7321fe88d13403b92027292bc35936f/src/chocolatey/infrastructure.app/builders/ConfigurationBuilder.cs#L303

### Describe The Solution. Why is it needed?

We should clarify that we don't scan _all downloaded packages_, and only specifically the files downloaded by a package during installation.

The current wording could be read as the above, but it could also be read as us scanning all files we download, including nupkgs, which is not the case.

### Additional Context

_No response_

### Related Issues

- https://github.com/chocolatey/docs/issues/546

Open src/chocolatey/infrastructure.app/builders/ConfigurationBuilder.cs at line 303 and review the current VirusCheck wording. Check related issue chocolatey/docs#546 for context, then update the explanation so it clearly distinguishes files downloaded by a package during installation from package archives and other downloads.

Written by the indexing model from the issue text.