[css-text] Move non-normative text to a note, further up in the section.

Author: fantasai

css-text/Overview.bs

@@ -1383,8 +1383,11 @@ Line Breaking Details</h3>
       Since optimal justification is language-sensitive,
       authors should correctly language-tag their content for the best results.
 
-    <p>The exact justification algorithm is UA-dependent;
-      however, CSS provides some general guidelines below.
+  Note: The guidelines in this level of CSS do not describe a complete
+    justification algorithm. They are merely a minimum set of requirements
+    that a complete algorithm should meet. Limiting the set of requirements
+    gives UAs some latitude in choosing a justification algorithm that
+    meets their needs and desired balance of quality, speed, and complexity.
 
 <h4 id="expanding-text">
 Expanding and Compressing Text</h4>
@@ -1527,13 +1530,6 @@ Possible Algorithms</h4>
       vs. the justification opportunity between a Han letter followed by a Hangul letter.
   </ul>
 
-  <p>The guidelines in this level of CSS do not describe a complete
-  justification algorithm. They are merely a minimum set of requirements
-  that a complete algorithm should meet. Limiting the set of requirements
-  gives UAs some latitude in choosing a justification algorithm that
-  meets their needs and desired balance of quality, speed, and complexity.
-
-
   <div class="example">
     <p>For instance, a basic but fast justification algorithm
     might use a simple greedy method for determining line breaks,