Improve the documentation on the transform classes

[sfilipi]

Documentation on the transform classes at docs.microsoft.com needs to be expanded.

[justinormont]

Will we have .MD versions of these XML docs? The readability of the docs in the repo are pretty low.

I'd purpose one or both of:

• Rendering the XML as .MD
• Adding a link at the top of the XML to the rendered version on docs.microsoft.com