Fix Documentation iamaresearcher.rst Tuning Hyperparameters

[darrylong]

Description

In the iamaresearcher.rst documentation, source codes for the example are incorrectly displayed. This result in inability to use GridSearch/RandomSearch for tuning hyperparameters.

Related Issues

Checklist:

• [ ] I have added tests.
• [ ] I have updated the documentation accordingly.
• [ ] I have updated README.md (if you are adding a new model).
• [ ] I have updated examples/README.md (if you are adding a new example).
• [ ] I have updated datasets/README.md (if you are adding a new dataset).

[tqtg]

LGTM

[tqtg]

should we merge this?