Update cumulative-metrics.md (#4705)

I found a typo while looking at cumulative metrics docs. I think the
"cannot be used.." should be switched

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website/docs/docs/build/cumulative-metrics.md

@@ -31,8 +31,8 @@ metrics:
     label: The value that will be displayed in downstream tools # Required
     type_params: # Required
       measure: The measure you are referencing # Required
-      window: The accumulation window, such as 1 month, 7 days, 1 year. # Optional. Can not be used with window. 
-      grain_to_date: Sets the accumulation grain, such as month will accumulate data for one month, then restart at the beginning of the next.  # Optional. Cannot be used with grain_to_date
+      window: The accumulation window, such as 1 month, 7 days, 1 year. # Optional. Cannot be used with grain_to_date
+      grain_to_date: Sets the accumulation grain, such as month will accumulate data for one month, then restart at the beginning of the next.  # Optional. Cannot be used with window
 
 ```