finally fixed link

Author: alvaropp

beginner_source/basics/buildmodel_tutorial.py

@@ -34,7 +34,7 @@
 # -----------------------
 # We want to be able to train our model on a hardware accelerator like the GPU or MPS,
 # if available. Let's check to see if `torch.cuda <https://pytorch.org/docs/stable/notes/cuda.html>`_
-# or `torch.backends.mps <https://pytorch.org/docs/stable/notes/mps.html>` are available, otherwise we use the CPU.
+# or `torch.backends.mps <https://pytorch.org/docs/stable/notes/mps.html>`_ are available, otherwise we use the CPU.
 
 device = (
     "cuda"