Rewrite D.1.1 Note

Matches proposal at #551 (comment)

Author: nigelmegitt

imsc1/spec/ttml-ww-profiles.html

@@ -4216,11 +4216,12 @@ <h4>Success Criterion 1.1.1 Non-text Content</h4>
         information to the <a>text alternative</a> in cases where styling is applied to the text image with a deliberate
         connotation, as a <em>functional</em> replacement for the applied style.</p>
 
-        <aside class="example">Considering a subtitling and captioning practice where italics are used to indicate an off screen
-          speaker context (for example a voice from a radio), an author can choose to include this functional information in the text
-          equivalent; for example, by including the word "Radio: " before the image equivalent text. Note that images in an <a>Image
-          Profile</a> <a>Document Instance</a> that are intended for use as <em>captions</em>, i.e. intended for a hard of hearing
-          audience, might already include this functional information in the rendered text.</aside>
+        <aside class="example">Considering a subtitling and captioning practice where styling is used to convey meaning,
+          for example using italics to indicate an off screen speaker context such as a voice from a radio,
+          an author can choose to describe this sense in the text equivalent;
+          in this example, by including the word "Radio: " before the image equivalent text.
+          Note that images in an <a>Image Profile</a> <a>Document Instance</a> that are intended for use as <em>captions</em>,
+          i.e. intended for a hard of hearing audience, might already include this styling in the rendered text.</aside>
 
         <p>During authoring, the <a data-cite="ttml2#metadata-value-named-item"><code>altText</code> named metadata item</a> can be
         used to associate a simple text string with an image to, for example:</p>