message: Update description in HMI_API
diff: </param>
  <param name="serviceType" type="String" mandatory="true">
  - <description> The type of service that is to be offered by this app </description>
  + <description> The type of service that is to be offered by this app. See AppServiceType for known enum equivalent types. Parameter is a string to allow for new service types to be used by apps on older versions of SDL Core. </description>
  </param>
  <param name="serviceIcon" type="Common.Image" mandatory="false">
  