Incorporate code review feedback

Author: neildsh

Microsoft.Azure.Cosmos/src/Handler/RequestMessage.cs

@@ -386,9 +386,12 @@ private bool AssertPartitioningPropertiesAndHeaders()
             bool partitionKeyRangeIdExists = !string.IsNullOrEmpty(this.Headers.PartitionKeyRangeId);
             if (partitionKeyRangeIdExists)
             {
-                OperationType op = this.OperationType;
+                OperationType operationType = this.OperationType;
                 // Assert operation type is not write
-                if (op != OperationType.Query && op != OperationType.QueryPlan && op != OperationType.ReadFeed && op != OperationType.Batch)
+                if (operationType != OperationType.Query
+                    && operationType != OperationType.QueryPlan
+                    && operationType != OperationType.ReadFeed 
+                    && operationType != OperationType.Batch)
                 {
                     throw new ArgumentOutOfRangeException(RMResources.UnexpectedPartitionKeyRangeId);
                 }