Clarify query parameter validation behavior

docs/en/docs/tutorial/query-params.md

@@ -20,6 +20,11 @@ http://127.0.0.1:8000/items/?skip=0&limit=10
 As they are part of the URL, they are "naturally" strings.
 
 But when you declare them with Python types (in the example above, as `int`), they are converted to that type and validated against it.
+For example, if `skip` is declared as an `int`, sending a value that cannot be converted to an integer: 
+```
+http://127.0.0.1:8000/items/?skip=abc
+```
+will result in a validation error because `"abc"` cannot be converted to an integer.
 
 All the same processes that apply to path parameters also apply to query parameters: