fix: Rename labeling_interface to label_interface

fern/pages/getting_started.mdx

@@ -50,8 +50,8 @@ Specify the project title and the labeling configuration. Choose your labeling c
 
 For example, create a text classification project in your Python code:
 ```python
-from label_studio_sdk.labeling_interface import LabelInterface
-from label_studio_sdk.labeling_interface.create import choices
+from label_studio_sdk.label_interface import LabelInterface
+from label_studio_sdk.label_interface.create import choices
 
 # Define labeling interface
 label_config = LabelInterface.create({