Minor edit

Author: msjasteppe

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

@@ -57,7 +57,7 @@ Group is the next *optional* stage where the normalized messages available from
 > - Measurement type
 > - Time period
 
-`Device identity` and `measurement type` grouping is optional and enabled by the use of the [SampledData](https://www.hl7.org/fhir/datatypes.html#SampledData) measurement type. The SampledData measurement type provides a concise way to represent a time-based series of measurements from a device message into FHIR Observation resources. When you use the SampledData measurement type, measurements can be grouped into a single FHIR Observation resource that represents a 1 hour period or 24 hour period.
+`Device identity` and `measurement type` grouping is optional and enabled by the use of the [SampledData](https://www.hl7.org/fhir/datatypes.html#SampledData) measurement type. The SampledData measurement type provides a concise way to represent a time-based series of measurements from a device message into FHIR Observation resources. When you use the SampledData measurement type, measurements can be grouped into a single FHIR Observation resource that represents a 1-hour period or a 24-hour period.
 
 ## Transform
 Transform is the next stage where normalized device messages are processed using user-selected/user-created conforming and valid [FHIR destination mappings](how-to-configure-fhir-mappings.md). Normalized device messages get transformed into FHIR Observation resources if a matching FHIR destination mapping has been authored.