Minor update

Author: msjasteppe

articles/healthcare-apis/iot/understand-service.md

@@ -22,7 +22,7 @@ The MedTech service device message data processing follows these steps and in th
 > [!div class="checklist"]
 > - Ingest
 > - Normalize - Device mappings applied.
-> - Group - Optional.
+> - Group - (Optional)
 > - Transform - FHIR destination mappings applied.
 > - Persist
 
@@ -52,7 +52,7 @@ Normalize is the next stage where device message data is processed using user-se
 
 The normalization process not only simplifies data processing at later stages, but also provides the capability to project one device message into multiple normalized messages. For instance, a device could send multiple vital signs for body temperature, pulse rate, blood pressure, and respiration rate in a single device message. This device message would create four separate FHIR Observation resources. Each resource would represent a different vital sign, with the device message projected into four different normalized messages.
 
-## Group - Optional
+## Group - (Optional)
 Group is the next *optional* stage where the normalized messages available from the MedTech service normalization stage are grouped using three different parameters:
 
 > [!div class="checklist"]