Update metrics-overview.md (#5190)

fixing bug (constraint should be filter)

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

@@ -174,7 +174,7 @@ metrics:
 
 ### Ratio metrics 
 
-[Ratio metrics](/docs/build/ratio) involve a numerator metric and a denominator metric. A  `constraint` string  can be applied to both the numerator and denominator or separately to the numerator or denominator.
+[Ratio metrics](/docs/build/ratio) involve a numerator metric and a denominator metric. A  `filter` string  can be applied to both the numerator and denominator or separately to the numerator or denominator.
 
 ```yaml
 metrics: