Update measures.md (#5875)

One more correction. This was written as a count, but the metric is
meant to be a sum of the transaction amount.

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website/docs/docs/build/measures.md

@@ -147,7 +147,7 @@ semantic_models:
         agg: average 
       - name: transactions_amount_usd_valid # Notice here how we use expr to compute the aggregation based on a condition
         description: The total USD value of valid transactions only
-        expr: CASE WHEN is_valid = True then 1 else 0 end 
+        expr: CASE WHEN is_valid = True then transaction_amount_usd else 0 end 
         agg: sum
       - name: transactions
         description: The average value of transactions.