fix indentation error

Author: yamini-labelbox

labelbox/schema/identifiables.py

@@ -5,6 +5,7 @@
 class IdType(str, Enum):
     """
     The type of id used to identify a data row.
+    
     Currently supported types are:
         - DataRowId: The id assigned to a data row by Labelbox.
         - GlobalKey: The id assigned to a data row by the user.