Update draft-salowey-wimse-arch.md

Modified based on Yarslav's changes

draft-salowey-wimse-arch.md

@@ -57,7 +57,7 @@ TODO Introduction
 
 * Workload
 
-A workload is a running instance of software executing for a specific purpose.
+A workload is a running instance of software executing for a specific purpose that interacts with other parts of a larger system. A workload may exist for a very short durations of time (nanoseconds) and run for a specific purpose such as to provide a response to an API request. Other kinds of workloads may execute for a very long duration such as months or years - examples include database services and machine learning training jobs.
 
 
 # Use Cases