title: Alignment of title in fig.suptitle
body: <p>I want to write title at the centre of the plot, however I am getting the following:</p>
  
  <p><a href="https://i.stack.imgur.com/N2qyj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/N2qyj.png" alt="enter image description here"></a></p>
  
  <p>The following is the piece of my code:</p>
  
  <pre><code>fig = plt.figure(figsize=(11.69, 8.27))
  fig.suptitle(r"$Ti_2$$Si_2$$Te_2$")
  </code></pre>
  
  <p>How to align the title at the centre?</p>