Mention the ivy2Local predefined repository

[przemek-pokrywka]

The ivy2Local predefined repository is most useful when you publish local artifacts with SBT.

Sometimes you work on a large application built with SBT, yet you still want to write scripts that use a part of the application's logic. Then you can publish your application's artifacts from SBT with publishLocal and then consume these artifacts from scala-cli using scala-cli --repository ivy2Local --dep myapp::artifact:1.0-SNAPSHOT

[Gedochao]

The reference part of the docs is mostly generated from code, so you have to change it there, and then regenerate the docs with

./mill -i 'generate-reference-doc[]'.run

as per https://github.com/VirtusLab/scala-cli/blob/main/CONTRIBUTING.md#rules-for-a-well-formed-pr

The relevant piece of code, where this doc actually lives:

scala-cli/modules/directives/src/main/scala/scala/build/preprocessing/directives/Repository.scala

Line 41 in 27cb278

|Accepts predefined repositories supported by Coursier (like `sonatype:snapshots` or `m2Local`) or a URL of the root of Maven repository""".stripMargin