Fix dimension name (#4272)

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

@@ -34,7 +34,7 @@ metrics:
     config: here for `enabled`            ## Optional
     label: The display name for your metric. This value will be shown in downstream tools. ## Required
     filter: |                             ## Optional            
-      {{  Dimension('entity__name') }} > 0 and {{ Dimension(' entity__another name') }} is not
+      {{  Dimension('entity__name') }} > 0 and {{ Dimension(' entity__another_name') }} is not
       null
 ```