Adding license documentation to interface class docblocks.

src/Mod/Assembly/App/AssemblyLink.pyi

@@ -10,6 +10,8 @@ from App.Part import Part
 )
 class AssemblyLink(Part):
     """
+    Author: Ondsel (development@ondsel.com)
+    License: LGPL-2.1-or-later
     This class handles document objects in Assembly
     """