Fix typo

Co-authored-by: Ryan Dick <ryanjdick3@gmail.com>

Author: StAlKeR7779

invokeai/app/invocations/model.py

@@ -307,7 +307,7 @@ def invoke(self, context: InvocationContext) -> SDXLLoraLoaderOutput:
             model_name=lora_name,
             model_type=ModelType.Lora,
         ):
-            raise Exception(f"Unkown lora name: {lora_name}!")
+            raise Exception(f"Unknown lora name: {lora_name}!")
 
         if self.unet is not None and any(lora.model_name == lora_name for lora in self.unet.loras):
             raise Exception(f'Lora "{lora_name}" already applied to unet')