Generator Example Docs should refer to other tests in the repo

[idreeskhan]

Currently the examples are fairly straight forward and only show one possible method of using the generators. We could refer to other tests as examples for testing with pipelines https://github.com/spotify/ratatool/blob/master/ratatool-sampling/src/test/scala/com/spotify/ratatool/samplers/BigSamplerTest.scala#L211

Possibly can construct similar tests for examples module but maybe overly complicated to do so