Update sources/platform/actors/development/actor_definition/dataset_schema/validation.md

Co-authored-by: Michał Olender <[email protected]>

Author: katacek

sources/platform/actors/development/actor_definition/dataset_schema/validation.md

@@ -206,9 +206,7 @@ You can also use [conversion tools](https://www.liquid-technologies.com/online-j
 
 ## Dataset field statistics
 
-When you have the dataset fields schema set up, we then use the schema to generate a list of fields and measure statistics for these fields.
-
-The measured statistics are following:
+When you configure the dataset fields schema, we generates a field list and measure the following statistics:
 
 - **Null count:** how many items in the dataset have the field set to null
 - **Empty count:** how many items in the dataset are `undefined` , meaning that for example empty string is not considered empty