Python docs: add examples for Grid Search

[exalate-issue-sync]

Add examples to Grid Search in the Python docs:
https://github.com/h2oai/h2o-3/blob/master/h2o-py/h2o/grid/grid_search.py

Grid search tests will be included in different algorithms. For example: https://github.com/h2oai/h2o-3/blob/master/h2o-py/tests/testdir_algos/gbm/pyunit_gbm_random_grid.py

Some examples are also included in the User Guide:
http://docs.h2o.ai/h2o/latest-stable/h2o-docs/grid-search.html#grid-search-in-python

[exalate-issue-sync]

Angela Bartz commented: Pull request merged into master.

[h2o-ops]

JIRA Issue Migration Info

Jira Issue: PUBDEV-7076
Assignee: hannah.tillman
Reporter: Angela Bartz
State: Resolved
Fix Version: 3.30.0.1
Attachments: N/A
Development PRs: Available

Linked PRs from JIRA

#4192