Minor communication improvements regarding expectations on Windows

[s-h-a-d-o-w]

Awesome to see bun making it to Windows!
But I've noticed the following minor things regarding communication:

• After installation, you say that all that's needed is a terminal restart. That might be true for powershell but it doesn't work for cmd. For the sake of less experienced developers who prefer cmd's performance, it might be worth pointing out that a restart is necessary for cmd. (There's refreshenv but... restart tends to be less friction and permanent.)
• I believe you should be transparent about not using links for package management on Windows here and here. Because that's been the key point for differentiation for pnpm and bun seems great enough to be able to admit that. 🙂