Update introduction_to_web_accessibility.md

advanced_html_css/accessibility/introduction_to_web_accessibility.md

@@ -6,7 +6,7 @@ What you may not have too much an understanding of, though, is the topic of acce
 
 ### Lesson overview
 
-By the end of this lesson, you should be able to:
+This section contains a general overview of topics that you will learn in this lesson.
 
 - Explain what web accessibility is.