Fix doc's index to show properly in bob/docs

doc/index.rst

+
+.. _bob.learn.pytorch:
+
 ====================
 PyTorch Bob Bindings
 ====================
@@ -5,7 +8,6 @@ PyTorch Bob Bindings
 `bob.learn.pytorch` is a high-level library, written in Python that runs on top of PyTorch.
 The goal here is to be able to do fast experimentation with neural networks.
 
-===========
 Users Guide
 ===========
 
@@ -18,7 +20,6 @@ Users Guide
    guide_mccnn_pad.rst
    guide_audio_extractor.rst
 
-================
 Reference Manual
 ================