Update src/coding-guidelines/values.rst

Co-authored-by: Félix Fischer <felix91gr@users.noreply.github.com>

Author: rcseacord

src/coding-guidelines/values.rst

@@ -14,7 +14,7 @@ Values
    :fls: fls_6lg0oaaopc26
    :decidability: undecidable
    :scope: system
-   :tags: undefined-behavior, unsafe
+   :tags: undefined-behavior, unsafe, defect
 
    Do not create a typed value from uninitialized memory.
    Types that explicitly permit an uninitialized state (e.g., ``MaybeUninit<T>`` or a union that includes ``()``) may hold uninitialized bytes as values,