Fix] Fix three typos in runner (#1068)

mmengine/runner/runner.py

@@ -1459,7 +1459,7 @@ class Runner:
             return loop
         elif not isinstance(loop, dict):
             raise TypeError(
-                f'loop should be a Loop object or dict, but got {loop}')
+                f'train_loop should be a Loop object or dict, but got {loop}')
 
         loop_cfg = copy.deepcopy(loop)
 
@@ -1505,7 +1505,7 @@ class Runner:
             return loop
         elif not isinstance(loop, dict):
             raise TypeError(
-                f'train_loop should be a Loop object or dict, but got {loop}')
+                f'val_loop should be a Loop object or dict, but got {loop}')
 
         loop_cfg = copy.deepcopy(loop)
 
@@ -1547,7 +1547,7 @@ class Runner:
             return loop
         elif not isinstance(loop, dict):
             raise TypeError(
-                f'train_loop should be a Loop object or dict, but got {loop}')
+                f'test_loop should be a Loop object or dict, but got {loop}')
 
         loop_cfg = copy.deepcopy(loop)  # type: ignore