Fix typo: multidimension -> multidimensional

Author: changeworld

articles/storage/blobs/monitor-blob-storage.md

@@ -224,7 +224,7 @@ The following example shows how to read `UsedCapacity` data at the account level
 
 For multidimensional metrics, you need to define metadata filters if you want to read metric data on specific dimension values.
 
-The following example shows how to read metric data on the metric supporting multidimension:
+The following example shows how to read metric data on the metric supporting multidimensional:
 
 ```csharp
     public static async Task ReadStorageMetricValueTest()