refactor: make description optional on a couple of classes

Author: yt-ms

src/structurizr/model/software_system.py

@@ -80,7 +80,7 @@ def containers(self) -> Iterable[Container]:
         return list(self._containers)
 
     def add_container(
-        self, name: str, description: str, technology: str = "", **kwargs
+        self, name: str, description: str = "", technology: str = "", **kwargs
     ) -> Container:
         """Construct a new `Container` and add to this system and its model."""
         container = Container(

src/structurizr/model/static_structure_element.py

@@ -53,7 +53,7 @@ class StaticStructureElement(Element, ABC):
     def uses(
         self,
         destination: Element,
-        description: str,
+        description: str = "Uses",
         technology: str = "",
         **kwargs,
     ) -> Optional["Relationship"]: