Docs don't build with new sphinx version

Job #257923 failed for f420d1b3:

bob/learn/tensorflow/losses/__init__.py:docstring of bob.learn.tensorflow.losses.center_loss.CenterLossLayer.call:11:Unexpected indentation.

Edited Feb 22, 2022 by Amir MOHAMMADI

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information