[css-navigation-1][editorial] Fix typo in function name.

Author: dbaron

css-navigation-1/Overview.bs

@@ -94,7 +94,7 @@ or <code>password</code> since they seem unlikely to be useful.
 
 <div class="issue">
 It's possible that this syntax with init descriptors in the ''@route'' rule
-would make more sense as part of the ''urlpattern()'' function
+would make more sense as part of the ''url-pattern()'' function
 (that is, as an alternate syntax for what goes inside the function).
 
 This would also give us the option to remove the braces from