Editorial tweak of an example.

Author: tabatkins

css-variables/Overview.html

@@ -429,7 +429,8 @@ <h2 id=defining-variables><span class=secno>2. </span> Defining Variables
    <p>The &lt;one> element defines a value for &lsquo;<code
     class=property>data-foo</code>&rsquo;. The &lt;two> element inherits this
     value, and additionally assigns a value to &lsquo;<code
-    class=property>data-bar</code>&rsquo;. Finally, the &lt;three> element
+    class=property>data-bar</code>&rsquo; using the &lsquo;<code
+    class=css>foo</code>&rsquo; variable. Finally, the &lt;three> element
     inherits the &lsquo;<code class=property>data-bar</code>&rsquo; value
     <em>after</em> variable substitution (in other words, it sees the value
     &lsquo;<code class=css>calc(10px + 10px)</code>&rsquo;), and then

css-variables/Overview.src.html

@@ -200,7 +200,7 @@ <h2 id="defining-variables">
 two   { data-bar: calc(data(foo) + 10px); }
 three { data-foo: calc(data(bar) + 10px); }</pre>
 
-		<p>The &lt;one> element defines a value for 'data-foo'.  The &lt;two> element inherits this value, and additionally assigns a value to 'data-bar'.  Finally, the &lt;three> element inherits the 'data-bar' value <em>after</em> variable substitution (in other words, it sees the value ''calc(10px + 10px)''), and then redefines 'data-foo' in terms of that value.  Since the value it inherited for 'data-bar' no longer contains a reference to the 'data-foo' property defined on &lt;one>, defining 'data-foo' using the ''data(bar)'' variable is not cyclic, and actually defines a value that will eventually (when referenced as a variable in a normal property) resolve to ''30px''.</p>
+		<p>The &lt;one> element defines a value for 'data-foo'.  The &lt;two> element inherits this value, and additionally assigns a value to 'data-bar' using the ''foo'' variable.  Finally, the &lt;three> element inherits the 'data-bar' value <em>after</em> variable substitution (in other words, it sees the value ''calc(10px + 10px)''), and then redefines 'data-foo' in terms of that value.  Since the value it inherited for 'data-bar' no longer contains a reference to the 'data-foo' property defined on &lt;one>, defining 'data-foo' using the ''data(bar)'' variable is not cyclic, and actually defines a value that will eventually (when referenced as a variable in a normal property) resolve to ''30px''.</p>
 	</div>
 
 	<p>The initial value of a <i>data property</i> is a special invalid value which makes the associated variable an <i>invalid variable</i>.  This is represented by the keyword ''invalid'', but that keyword has no special meaning in itself, and is valid if set explicitly in a data property.</p>