[css-variables] Fix the grammar of var().

--HG--
extra : rebase_source : 93107c4bfb0146f3f6e52eaa79b2ec886c6c3c51

Author: tabatkins

css-variables/Overview.html

@@ -559,9 +559,7 @@ <h2 id=using-variables><span class=secno>3. </span> Using Cascading
    syntax, or else a value whose meaning has no connection to the variable.)
 
   <p> The <var>&lt;fallback></var> value is identical to the syntax of a <a
-   href="#custom-property"><i>custom property</i></a>, except that unmatched
-   ) tokens cannot appear at the top-level. (They will be interpreted as
-   closing the function.)
+   href="#custom-property"><i>custom property</i></a>.
 
   <p> If the variable named by the first argument is valid, the variable's
    value is substituted as normal. If it's invalid, and a

css-variables/Overview.src.html

@@ -395,9 +395,7 @@ <h2 id='using-variables'>
 		or else a value whose meaning has no connection to the variable.)
 
 	<p>
-		The <var>&lt;fallback></var> value is identical to the syntax of a <i>custom property</i>,
-		except that unmatched ) tokens cannot appear at the top-level.
-		(They will be interpreted as closing the function.)
+		The <var>&lt;fallback></var> value is identical to the syntax of a <i>custom property</i>.
 
 	<p>
 		If the variable named by the first argument is valid,