Update fern/docs/pages/customization.mdx

Co-authored-by: Atul-Butola <atul.butola@devrev.ai>

Author: shivansh

fern/docs/pages/customization.mdx

@@ -656,6 +656,6 @@ The `effects` array contains the list of effects of the condition. The following
 stage display name is not used in the expression because it is liable to change.
 </Callout>
 
-It should be noted that constraints on stock fields can only be strengthened.
+Constraints on stock fields can only be strengthened.
 For example, a required stock field cannot be made optional and a hidden stock
 field cannot be made visible.