Update types-and-traits.rst

Author: rcseacord

src/coding-guidelines/types-and-traits.rst

@@ -16,8 +16,9 @@ Types and Traits
    :category: required
    :status: draft
    :release: 1.85.0
+   :fls: fls_oFIRXBPXu6Zv
    :decidability: undecidable
-   :scope: expression
+   :scope: system
    :tags: defect, safety, undefined-behavior
 
    When reading from a union field, ensure that the underlying bytes constitute a valid value