update message for "dotnet dev-cert https --trust"

[danmoseley]

I noticed it creates one if not present (eg., you did --clean) but the help message did not show how to create one.

[danmoseley]

Well, actually "dotnet dev-certs https" alone will create one if necessary (but untrusted).. Not sure where I'd put that. This change is accurate and an improvement. The actual docs explain all.

[adityamandaleeka]

Note that when --check is also used with --trust it will just bail if there's no existing cert.

[danmoseley]

updated, now looks like this:

Usage: dotnet dev-certs https [options]

Options:
...
  --format           Export the certificate in the given format. Valid values are Pfx and Pem. Pfx is the default.
  -t|--trust         When not combined with the --check option, trusts the certificate on the current platform, creating one if necessary.
                     When combined with the --check option, validates that there is a certificate and it is trusted.
  -v|--verbose       Display more debug information.
...

[danmoseley]

@adityamandaleeka ok ?