Update tutorial's ivy resolver docs.

[scottrice10]

I followed the Contributing docs for Documentation, and the documentation website looks as expected on my local.

I believe following this documentation update solves both of these issues: 1077 and 1074.

Documentation around [defaultPattern] usage can also be found in Ammonite docs and tests.

I have verified using [defaultPatten] works for resolving custom ScalaFix rules I've published to an internal / private company artifactory registry.

[bjaglin]

Great, thank you for investigating and documenting your findings!