Fix #270, Update CF_ProcessMsg() comment description

[thnkslprpt]

Checklist

• [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 Fixes #270 Corrected description for the CF_ProcessMsg() function in cf_app.h

Testing performed GitHub CI actions (incl. Build + Run, Unit Tests etc.) all passing successfully.

Expected behavior changes None - comment change only.

Contributor Info Avi Weiss @thnkslprpt