F53: Remove Example 3 as it's same as Example 2

Remove Example 3 as it's same as Example 2.

F55: Failure of Success Criteria 2.1.1, 2.4.7, and 3.2.1 due to using script to remove focus when focus is received
http://www.w3.org/WAI/GL/2014/WD-WCAG20-TECHS-20140724/F55.html