Generate XML docs for fluent libraries.

[twitchax]

Description

This PR adds "xmlDocs": "true" to all project.json files for fluent client libraries.

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• I have read the contribution guidelines.
• The pull request does not introduce breaking changes.

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• Title of the pull request is clear and informative.
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Testing Guidelines

• Pull request includes test coverage for the included changes.

SDK Generation Guidelines

• If an SDK is being regenerated based on a new swagger spec, a link to the pull request containing these swagger spec changes has been included above.
• The generate.cmd file for the SDK has been updated with the version of AutoRest, as well as a link to the swagger spec, used to generate the code.
• The project.json and AssemblyInfo.cs files have been updated with the new version of the SDK.

[msftclas]

@twitchax,
Thanks for your contribution as a Microsoft full-time employee or intern. You do not need to sign a CLA.
Thanks,
Microsoft Pull Request Bot

[TreeHouseNotesINC]

Thank you