Apply suggestions from code review

Co-authored-by: Jan-Erik Rediger <[email protected]>

docs/user/metrics/quantity.md

@@ -1,6 +1,6 @@
 # Quantity
 
-Used to record a single non-negative integer value or 0.
+Used to record a single non-negative integer value (including 0).
 For example, the width of the display in pixels.
 
 > **IMPORTANT** If you need to _count_ something (e.g. number of tabs open or number of times a button is pressed) prefer using the [Counter](./counter.md) metric type, which has a specific API for counting things and also takes care of resetting the count at the correct time.
@@ -146,7 +146,7 @@ Assert.Equal(
 
 ## Limits
 
-* Quantities must be non-negative integers or 0.
+* Quantities must be non-negative integers (including 0).
 
 ## Examples