invalid escape sequences in h2o-py docstrings

[jmahlik]

H2O version, Operating System and Environment
main branch, windows, python 3.12+

Actual behavior
There are some invalid escape sequences in the docstrings of h2o-py.

These will eventually raise errors when the package is imported. https://docs.python.org/3/whatsnew/3.12.html#other-language-changes. I ran in to this when generating documentation via sphinx when h2o is installed. It causes sphinx to crash since sphix is using the content of the docstrings.

python -Werror ./venv/Lib/site-packages/h2o/model/model_base.py
...\venv\Lib\site-packages\h2o\model\model_base.py:913: SyntaxWarning: invalid escape sequence '\s'
  """
python -Werror ./venv/Lib/site-packages/h2o/estimators/xgboost.py
...\venv\Lib\site-packages\h2o\estimators\xgboost.py", line 2559
    """
    ^^^
SyntaxError: invalid escape sequence '\*'

• h2o-3/h2o-py/h2o/model/model_base.py

  Line 918 in 8ff06da

  The :math:`R^2` value is defined to be :math:`1 - MSE / var`, where var is computed as :math:`\sigma * \sigma`.

• h2o-3/h2o-py/h2o/estimators/xgboost.py

  Line 2571 in 8ff06da

  - h2oModelD = H2OXGBoostEstimator(\*\*h2oParamsD) # parameters specified as a dict()

Expected behavior
Replace the invalid sequences with valid escapes or use raw strings

Steps to reproduce
Steps to reproduce the behavior (with working code on a sample dataset, if possible):
Just running the file is enough to trigger this i.e. python -Werror ./venv/Lib/site-packages/h2o/estimators/xgboost.py

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If you can, please upload the H2O logs. More information on how to do that is available here, or you can use the h2o.downloadAllLogs() in R or the h2o.download_all_logs() function in Python.

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Additional context
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