[css-text-3][css-break-3] Clarify aliasing mechanisms #866

Closes #866

css-break-3/Overview.bs

@@ -479,7 +479,7 @@ Page Break Aliases: the 'page-break-before', 'page-break-after', and 'page-break
   UAs that conform to [[!CSS21]] must alias the
   'page-break-before', 'page-break-after', and 'page-break-inside' properties
   to 'break-before', 'break-after', and 'break-inside'
-  by treating the 'page-break-*' properties as shorthands for the 'break-*' properties
+  by treating the 'page-break-*' properties as [=legacy shorthands=] for the 'break-*' properties
   with the following value mappings:
 
   <table class="data">
@@ -1154,6 +1154,16 @@ Transforms, Positioning, and Pagination</h3>
 <h2 class="no-num" id="changes">
 Changes</h2>
 
+  <p>The following significant changes were made since the
+    <a href="https://www.w3.org/TR/2017/CR-css-break-3-20170209/">9 February 2017 Candidate Recommendation</a>:
+
+  <ul>
+    <li id="change-2018-aliasing">Clarify the mechanism of aliasing for the page-break-* properties
+    <blockquote>
+      <p>by treating the 'page-break-*' properties as <del>shorthands</del> <ins>[=legacy shorthands=]</ins> for the 'break-*' properties
+    </blockquote>
+  </ul>
+
   <p>The following significant changes were made since the
     <a href="https://www.w3.org/TR/2016/CR-css-break-3-20160114/">14 January 2016 Candidate Recommendation</a>:
 

css-text-3/Overview.bs

@@ -1287,8 +1287,8 @@ Line Breaking Details</h3>
     <p><a>Soft wrap opportunities</a> introduced by ''overflow-wrap: break-word''
        <em>are</em> considered when calculating <a lt="min-content size">min-content intrinsic sizes</a>.
 
-    <p>For legacy reasons, UAs must treat 'word-wrap' as an alternate name
-      for the 'overflow-wrap' property, as if it were a <a>shorthand</a> of 'overflow-wrap'.
+    <p>For legacy reasons, UAs must treat 'word-wrap' as an [=legacy name alias=]
+      of the 'overflow-wrap' property.
 
 <h3 id="word-break-shaping">
 Shaping Across Intra-word Breaks</h3>