[css-align] Clarify that ''justify-items:legacy right'' only does something special to ''justify-self:auto''.

Author: tabatkins

css-align/Overview.bs

@@ -868,7 +868,8 @@ Inline/Main-Axis Alignment: the 'justify-items' property</h3>
 		<dd>
 			This keyword causes the value to effectively inherit into descendants.
 			It can only be combined with the ''<content-position>/center'', ''left'', and ''right'' positions.
-			The alignment keyword, but not the ''legacy'' keyword, is passed to 'justify-self'.
+			When ''justify-self:auto'' retrieves the value of 'justify-items',
+			only the alignment keyword, not the ''legacy'' keyword, is passed to it.
 			It exists to implement the legacy alignment behavior of HTML's <code>&lt;center></code> element and <code>align</code> attribute.
 	</dl>
 

css-align/Overview.html

@@ -1694,7 +1694,8 @@ <h3 class="heading settled" data-level="6.1" id="justify-items-property"><span c
         <dd>
 			This keyword causes the value to effectively inherit into descendants.
 			It can only be combined with the <a class="css" data-link-for="" data-link-type="maybe" href="#valdef-item-position-content-position-center">center</a>, <a class="css" data-link-type="maybe" href="#valdef-item-position-content-position-left">left</a>, and <a class="css" data-link-type="maybe" href="#valdef-item-position-content-position-right">right</a> positions.
-			The alignment keyword, but not the <a class="css" data-link-type="maybe" href="#valdef-justify-items-legacy">legacy</a> keyword, is passed to <a class="property" data-link-type="propdesc" href="#propdef-justify-self">justify-self</a>.
+			When <span class="css">justify-self:auto</span> retrieves the value of <a class="property" data-link-type="propdesc" href="#propdef-justify-items">justify-items</a>,
+			only the alignment keyword, not the <a class="css" data-link-type="maybe" href="#valdef-justify-items-legacy">legacy</a> keyword, is passed to it.
 			It exists to implement the legacy alignment behavior of HTML’s <code>&lt;center></code> element and <code>align</code> attribute.
 	</dd>
       </dl>