message: mstarch: fixing comments used for documentation
diff: # - `UT_SOURCE_FILES`: (optional) specify sources for unit tests used with `register_fprime_ut`
  # - `UT_MOD_DEPS`: (optional) specify modules for unit tests used with `register_fprime_ut`
  #
  -# See: [API.cmake](API.cmake)
  +# See: [API.md](API.md)
  #
  # **Example:**
  # ```
  