Create examples for the Tree Class section in the Python documentation

[exalate-issue-sync]

The http://docs.h2o.ai/h2o/latest-stable/h2o-py/docs/tree.html#h2o-tree-class section in the Python documentation is missing examples.
Also, the description needs to change from:

"Represents a model of a Tree built by one of H2O’s algorithms (GBM, Random Forest)."
to
"Represents a model of a Tree built by one of H2O’s algorithms (GBM, Random Forest, XGBoost, Isolation Forest)."

The source file is located at h2o-3/h2o-py/tree/tree.py

Examples are available https://github.com/h2oai/h2o-3/blob/master/h2o-py/tests/testdir_tree/pyunit_tree.py

The examples use the following datasets:
airlines = h2o.import_file("https://s3.amazonaws.com/h2o-public-test-data/smalldata/airlines/AirlinesTrain.csv")
cars = h2o.import_file("https://s3.amazonaws.com/h2o-public-test-data/smalldata/junit/cars_nice_header.csv")
ecg_discord = h2o.import_file("https://s3.amazonaws.com/h2o-public-test-data/smalldata/anomaly/ecg_discord_train.csv")

[h2o-ops]

JIRA Issue Migration Info

Jira Issue: PUBDEV-6742
Assignee: hannah.tillman
Reporter: Angela Bartz
State: Resolved
Fix Version: 3.28.0.1
Attachments: N/A
Development PRs: Available

Linked PRs from JIRA

#3769