Update WDS student guide - Optimized architecture.md

March 2019 test/fix QC.

Whiteboard design session/WDS student guide - Optimized architecture.md

@@ -18,6 +18,7 @@ Information in this document, including URL and other Internet Web site referenc
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@@ -182,7 +183,7 @@ size (16 cores, 224GB RAM).
 Contoso IT Operations team does use some third-party tools to aggregate
 server metrics for simplified reporting and monitoring processes.
 However, the primary method they used to gather the CPU and RAM
-utilization of the specific workload to target was to sign in to the
+utilization of the specific workload to target was to sign into the
 Azure Portal and access Azure's VM monitoring within the Virtual Machine
 blade. They gathered both the "CPU percentage" and "Memory usage"
 statistics to get average CPU and RAM utilization percentages for the