Add object import to docs

Author: minitriga

docs/docs/python-sdk/topics/object_file.mdx

@@ -38,6 +38,8 @@ Multiple object files can be loaded at once by specifying the path to multiple f
 The `object load` command will create/update the objects using an `Upsert` operation. All objects previously loaded will NOT be deleted in the Infrahub instance.
 Also, if some objects present in different files are identical and dependent on each other, the `object load` command will NOT calculate the dependencies between the objects and as such it's the responsibility of the users to execute the command in the right order.
 
+> Object files can also be loaded into Infrahub when using external Git repositories. To see how to do this, please refer to the [.infrahub.yml](https://docs.infrahub.app/topics/infrahub-yml#objects) documentation.
+
 ### Validate the format of object files
 
 The object file can be validated using the `infrahubctl object validate` command.