Fix #410, correct CCSDS Blue Book version

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 Updates doxygen text to reflect CCSDS Blue Book version 727.0-B-5 - as opposed to CCSDS 727.0-B-4.

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

nasa / CF