fix(markdown): Add missing list property to Attributes and Defs docs

markdown/dev/reference/api/attributes/en.md

@@ -12,6 +12,12 @@ Attributes new Attributes()
 
 The Attributes constructor takes no arguments.
 
+## Properties
+
+An Attributes object comes with the following property:
+
+- `list` : The of individual attributes.
+
 ## Methods
 An Attributes object exposes the following methods:
 

markdown/dev/reference/api/defs/en.md

@@ -7,9 +7,15 @@ The `Defs` object in FreeSewing's core library represents an SVG document's
 It is not directly exposed, but it is available as the `defs` attribute
 of an [Svg object](/reference/api/svg/defs).
 
-While the methods exposed by this object are typically only used internally,
+While the properties and methods exposed by this object are typically only used internally,
 they are documented here to facilitate development of plugins.
 
+## Properties
+
+A Defs object comes with the following property:
+
+- `list` : The entries of the `defs` element.
+
 ## Defs methods
 
 <ReadMore />