[css-navigation-1][editorial] Fix section title.

Author: dbaron

css-navigation-1/Overview.bs

@@ -455,7 +455,7 @@ ISSUE: This should probably have a more formal definition of the function,
 but I can't find the formal definitions of the existing ''if()'' functions
 to model it after.
 
-<h2 id="link-navigation-pseudo-classes">Pseudo-class for navigation-related links: '':link-to()'' and '':active-navigation()''</h2>
+<h2 id="link-navigation-pseudo-classes">Pseudo-classes for links</h2>
 
 <h3 id="link-to-pseudo-class">The ''::link-to()'' pseudo-class</h3>