login emails for vmname.exe.xyz say exe.dev in the subject

[josharian]

I just tried to log into vmname.shelley.exe.xyz.

The email subject reads:

Verify your email - exe.dev

And the body doesn't mention the ultimate target domain (except as a query parameter in the link).

This is a bit confusing. We should make this email clearer.

cc @bmizerany who might already be on top of this