[css-text] Clarify computation of 'match-parent'.

Author: fantasai

css-text/Overview.html

@@ -1707,7 +1707,7 @@ <h3 id=text-align><span class=secno>7.1. </span> Text Alignment: the ‘<a
      <th>Computed value:
 
      <td>specified value, except for ‘<code
-      class=property>match-parent</code>’ (see prose)
+      class=property>match-parent</code>’ which computes as defined below
   </table>
 
   <p>This property describes how inline contents of a block are aligned along
@@ -1770,12 +1770,12 @@ <h3 id=text-align><span class=secno>7.1. </span> Text Alignment: the ‘<a
     class=css>match-parent</code>’</dfn>
 
    <dd>This value behaves the same as ‘<code
-    class=property>inherit</code>’ except that an inherited ‘<code
-    class=property>start</code>’ or ‘<code class=property>end</code>’
-    keyword is calculated against its parent's ‘<code
-    class=property>direction</code>’ value and results in a computed value
-    of either ‘<code class=property>left</code>’ or ‘<code
-    class=property>right</code>’.
+    class=property>inherit</code>’ (computes to its parent's computed
+    value) except that a ‘<code class=property>start</code>’ or ‘<code
+    class=property>end</code>’ keyword is interpreted against its parent's
+    ‘<code class=property>direction</code>’ value and results in a
+    computed value of either ‘<code class=property>left</code>’ or
+    ‘<code class=property>right</code>’.
 
    <dt><dfn id=start-end title="text-align:start end">‘<code
     class=css>start end</code>’</dfn>

css-text/Overview.src.html

@@ -1242,7 +1242,7 @@ <h3 id="text-align">
         </tr>
         <tr>
           <th>Computed&#160;value:</th>
-          <td>specified value, except for 'match-parent' (see prose)</td>
+          <td>specified value, except for 'match-parent' which computes as defined below</td>
         </tr>
     </table>
 
@@ -1283,9 +1283,10 @@ <h3 id="text-align">
       </dd>
 -->
     <dt><dfn title="text-align:match-parent">''match-parent''</dfn></dt>
-      <dd>This value behaves the same as 'inherit' except that an inherited
-        'start' or 'end' keyword is calculated against its parent's 'direction'
-        value and results in a computed value of either 'left' or 'right'.
+      <dd>This value behaves the same as 'inherit'
+        (computes to its parent's computed value)
+        except that a 'start' or 'end' keyword is interpreted against its parent's 'direction' value
+        and results in a computed value of either 'left' or 'right'.
     <dt><dfn title="text-align:start end">''start end''</dfn>
       <dd>Specifies ''start'' alignment of the first line and any line
         immediately after a <i>forced line break</i>; and ''end'' alignment of