Update-Database --help shows wrong usage information

When performing an update-database, I wanted to use a connection different from the default. In order to discover the option to use, I run "update-database --help". This reported the option to use as `--connection `. This, however, didn't work. The answer I found in issue [#22390](https://github.com/dotnet/efcore/issues/22390): The option should be `-Connection `.

This basically solved my problem.

Issue [#31218](https://github.com/dotnet/efcore/issues/31218), referring to the aforementioned issue, is quite similar.

Now the point of this issue report is that the help should report the correct parameters, with single dashes instead of double.

[Using EF core tools v9.0.9]