Fixed typo in comment.

src/architectures.py

@@ -150,7 +150,7 @@ class ArchitectureComponent(ABC):
     @abstractmethod
     def process_request(self, request: ArchitectureRequest) -> None:
         """
-        The principle method that concrete implementations of a component must implement.
+        The principal method that concrete implementations of a component must implement.
         They should signal anything to the pipeline through direct modification of the provided
         request (i.e. amending the request text or response text, or setting the early_exit flag).
         :param request: The request which is flowing down the pipeline