Update v0.16.md

Author: Flo0807

guides/upgrading/v0.16.md

@@ -14,4 +14,5 @@ end
 
 ## Component changes
 
-- `Backpex.HTML.Layout.field_container/1` now uses a `dl` element instead of a `div` element to better align with HTML semantics.
+- `Backpex.HTML.Layout.field_container/1` now uses a `dl` element instead of a `div` element to better align with HTML semantics
+- `Backpex.HTML.Layout.input_label/1` has been enhanced by adding `as`, `for` and `rest` attribute