Editorial: correct case

Author: j9t

source

@@ -31295,7 +31295,7 @@ of various sizes."></strong></code></pre>
    <dd>
     <p>In some unfortunate cases, there might be no alternative text available at all, either
     because the image is obtained in some automated fashion without any associated alternative text
-    (e.g. a Webcam), or because the page is being generated by a script using user-provided images
+    (e.g., a webcam), or because the page is being generated by a script using user-provided images
     where the user did not provide suitable or usable alternative text (e.g. photograph sharing
     sites), or because the author does not themself know what the images represent (e.g. a blind
     photographer sharing an image on their blog).</p>