Add to docs that transform only works on numerical columns

Description

update the transform docs to indicate that it only works with numerical data.
See: https://h2oai.slack.com/archives/C04KNHH2H/p1584389368047200

Original question (March 16, 2020):

When transform = "standardize" for GLRM, it appears that only numeric columns are standardized and categorical/binary columns are skipped (which seems like the right approach): and Is that interpretation correct? Either way, is it possible to clarify the treatment of categorical/binary variables in the documentation for transform? https://github.com//h2oai/h2o-3/blob/master/h2o-docs/src/product/data-science/algo-params/transform.rst

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Angela Bartz

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Angela Bartz

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