[css-text-3] Clarify editorial note about line-break requirements

Author: litherum

css-text-3/Overview.bs

@@ -1249,11 +1249,13 @@ Line Breaking Details</h3>
     </ul>
 
     <p class="note">Note:
-      The specific rules listed above
-      only create distinctions in CJK text:
+      The requirements listed above
+      only create distinctions in CJK text.
+      In an implementation that matches only the rules above,
+      and no additional rules,
+      'line-break' would only affect CJK code points
       unless the writing system is tagged as
-      <a for=writing-system>Chinese</a> or <a for=writing-system>Japanese</a>,
-      only CJK code points are affected.
+      <a for=writing-system>Chinese</a> or <a for=writing-system>Japanese</a>.
       Future levels may add additional specific rules
       for other writing systems and languages
       as their requirements become known.