[css-variables] Add back the --> that mysteriously got deleted.

Author: tabatkins

css-variables/Overview.html

@@ -330,11 +330,11 @@ <h2 id=defining-variables><span class=secno>2. </span> Defining Custom
    while <dfn id=ltcdogt>&lt;CDO&gt;</dfn> and <dfn
    id=ltcdcgt>&lt;CDC&gt;</dfn> correspond to the tokens of the same name
    from the same chapter (they represent HTML comments showing up in CSS text
-   - "&lt;!--" and ""). This is a very technical way of saying that nearly
-   anything can be used in the value of a custom property, save unmatched
-   closing brackets ("]", ")", or "}"), a top-level semicolon (as it will end
-   the property), a "!important" that's not at the end, or invalid tokens
-   (such as BAD_STRING and BAD_URL).
+   - "&lt;!--" and "--&gt;"). This is a very technical way of saying that
+   nearly anything can be used in the value of a custom property, save
+   unmatched closing brackets ("]", ")", or "}"), a top-level semicolon (as
+   it will end the property), a "!important" that's not at the end, or
+   invalid tokens (such as BAD_STRING and BAD_URL).
 
   <p> Note: Custom properties can contain a trailing ‘<code
    class=css>!important</code>’, but this is automatically removed from the

css-variables/Overview.src.html

@@ -97,7 +97,7 @@ <h2 id='defining-variables'>
 	in <a href="http://www.w3.org/TR/CSS2/syndata.html#tokenization">CSS 2.1 Chapter 4.1</a> [[!CSS21]],
 	while <dfn>&lt;CDO></dfn> and <dfn>&lt;CDC></dfn> correspond to the tokens of the same name
 	from the same chapter
-	(they represent HTML comments showing up in CSS text - "&lt;!--" and "").
+	(they represent HTML comments showing up in CSS text - "&lt;!--" and "--&gt;").
 	This is a very technical way of saying that nearly anything can be used in the value of a custom property,
 	save unmatched closing brackets ("]", ")", or "}"),
 	a top-level semicolon (as it will end the property),