Add docs for R and Python clients on how to access attributes in model_summary

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Wendy Wong commented: There are many model attributes and not all of them are important. However, there may be rare ones that users are interested in getting at them. Here are some examples:

{{number_of_predictors_total}} and {{number_of_active_predictors}}.

Instead of writing APIs to access them, we can show the users how to get them in Python as:

{noformat}model._model_json["output"]['model_summary']['number_of_active_predictors']
model._model_json["output"]['model_summary']['number_of_predictors_total']{noformat}

Please add this little trick to GLM documentation.

[h2o-ops]

JIRA Issue Details

Jira Issue: PUBDEV-8700
Assignee: hannah.tillman
Reporter: Wendy Wong
State: Resolved
Fix Version: 3.36.1.2
Attachments: N/A
Development PRs: Available

[h2o-ops]

Linked PRs from JIRA

#6197