Update doxygen cFE API documentation

**Is your feature request related to a problem? Please describe.**
At minimum, CFE_TBL_NotifyByMessage is missing

**Describe the solution you'd like**
Scrub and include references to all API's in documentation

**Describe alternatives you've considered**
N/A

**Additional context**
N/A

**Requester Info**
Jacob Hageman - NASA/GSFC