Update src/backend/fastapi_app/rag_simple.py

Co-authored-by: Pamela Fox <pamela.fox@gmail.com>

Author: john0isaac

src/backend/fastapi_app/rag_simple.py

@@ -70,7 +70,7 @@ async def run(
         raise NotImplementedError
 
     @abstractmethod
-    async def retreive_and_build_context(
+    async def retrieve_and_build_context(
         self,
         chat_params: ChatParams,
         *args,