PUBDEV-6678: Add a "Defining a MOJO import" section to the MOJO import chapter (#3739)
PUBDEV-6678: Add a "Defining a MOJO import" section to the MOJO import chapter (#3739)

* PUBDEV-6678: Add a "Defining a MOJO import" section to the MOJO Import chapter

Added information about three different options that can be specific when using a Generic model.

* Minor updates

- Renamed "Defining" heading
- Added link to model_id in parameters appendix
- Bolded parameters that do not have links
- Add an Examples heading to separate the "Defining" from the example

michalkurka/h2o-3,h2oai/h2o-3,michalkurka/h2o-3,h2oai/h2o-3,h2oai/h2o-3,michalkurka/h2o-3,michalkurka/h2o-3,michalkurka/h2o-3,h2oai/h2o-3,michalkurka/h2o-3,h2oai/h2o-3,michalkurka/h2o-3,h2oai/h2o-3,h2oai/h2o-3,h2oai/h2o-3