[css-syntax] typo

Author: tabatkins

css-syntax/Overview.html

@@ -509,8 +509,8 @@ <h3 id=error-handling><span class=secno>2.1. </span> Error Handling</h3>
    throwing away only the minimum amount of content before returning to
    parsing as normal. This is because errors aren't always mistakes - new
    syntax looks like an error to an old parser, and it's useful to be able to
-   add new syntax to the language without worrying stylesheets that include
-   it being completely broken in older UAs.
+   add new syntax to the language without worrying about stylesheets that
+   include it being completely broken in older UAs.
 
   <p> The precise error-recovery behavior is detailed in the parser itself,
    but it's simple enough that a short description is fairly accurate:

css-syntax/Overview.src.html

@@ -220,7 +220,7 @@ <h3>
 		This is because errors aren't always mistakes - 
 		new syntax looks like an error to an old parser,
 		and it's useful to be able to add new syntax to the language
-		without worrying stylesheets that include it being completely broken in older UAs.
+		without worrying about stylesheets that include it being completely broken in older UAs.
 
 	<p>
 		The precise error-recovery behavior is detailed in the parser itself,