[css-device-adapt] Trivial clarification of "Resolve width value" algorithm

Author: cvrebert

css-device-adapt/Overview.bs

@@ -678,7 +678,7 @@ Resolve <code lt="width!!resolved">width</code> value</h4>
     </li>
 
     <li>
-        If <code lt="width!!resolved">width</code> is
+        Otherwise, if <code lt="width!!resolved">width</code> is
         ''viewport-length/auto'', set <code>width = height * (initial-width /
         initial-height)</code>, or <code>width = initial-width</code>
         if <code class="index"