When running `bin/rails -h` the following messages is shown:

> All commands can be run with -h (or --help) for more information.

This doesn't apply to the commands that are Rake tasks like db:migrate.
If you run `bin/rails db:migrate -h` you'll get the Rake help, which
can be confusing...

Instead, if we replace the `-h` argument with `--describe db:migrate`
Rails outputs the Rake task descriptions, which are a lot more helpful:

    rails db:migrate
        Migrate the database (options: VERSION=x, VERBOSE=false, SCOPE=blog).

Co-authored-by: Jonathan Hefner <jonathan@hefner.pro>