Fix #352, User's Guide CleanUp

[dmknutsen]

Checklist (Please check before submitting)

• [x] I reviewed the Contributing Guide.
• [x] I signed and emailed the appropriate Contributor License Agreement to GSFC-SoftwareRelease@mail.nasa.gov and copied cfs-program@lists.nasa.gov.

Describe the contribution Pushing doxygen update to refactor the CF User's Guide for @semaldona

Testing performed Build/Reviewed updated User's Guide

Contributor Info - All information REQUIRED for consideration of pull request Dan Knutsen NASA Goddard