Make small change to get tutorial to build

Author: SethHWeidman

beginner_source/audio_preprocessing_tutorial.py

@@ -7,7 +7,7 @@
 GPU support.
 
 Significant effort in solving machine learning problems goes into data
-preparation. torchaudio leverages PyTorch’s GPU support, and provides
+preparation. ``torchaudio`` leverages PyTorch’s GPU support, and provides
 many tools to make data loading easy and more readable. In this
 tutorial, we will see how to load and preprocess data from a simple
 dataset.