title: Multiline string not aligning properly with ax.annotate
body: <p>I have a multiline string as below</p>
  <pre><code>annotation_string = &quot;&quot;&quot;Excel file name: {0}
          Sheet name: {1}
          
          No.of Iterations: {2}
          Cp = {3}
          CpK = {4}
          
          Mean = {11}
          Standard Deviation = {12}
          
          The smallest simulated value is {5}
          The largest simulated value is {6}
          
          The 4sigma limit is from {7} to {8}
          The 5sigma limit is from {9} to {10}
          &quot;&quot;&quot;.format(filename,sheet,iterations,round(cp,4),round(cpk,4),smallest_val,
                    largest_val,round(mean_minor_sigma[3],5),round(mean_sigma[3],5),
                     round(mean_minor_sigma[4],5),round(mean_sigma[4],5),round(mittelwert,4),round(sigma,4))
  </code></pre>
  <p>I use the code below to plot this on an axis on a plot</p>
  <pre><code>        ax1.annotate(annotation_string, xy=(0.65, 0.65), xycoords='axes fraction',
                                                       backgroundcolor='r', fontsize=14,
                                                       horizontalalignment='left')
  </code></pre>
  <p>The result is as the pic below. AS you can see the text from 2nd line onwards has shifted right.</p>
  <p><a href="https://i.stack.imgur.com/LoKuo.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/LoKuo.png" alt="enter image description here" /></a></p>
  <p>However, when I change <code>horizontalalignment='left'</code> to <code>horizontalalignment='right'</code>. Every line is aligned properly</p>
  <p><a href="https://i.stack.imgur.com/wENh6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wENh6.png" alt="enter image description here" /></a></p>
  <p>I want the alignment to the left &amp; not to the right. How can I achieve this?</p>