Remove term reference from #3038 backport that doesn't exist in 2.1

Author: kfranqueiro

guidelines/sc/20/focus-visible.html

@@ -4,7 +4,7 @@ <h4>Focus Visible</h4>
 
    <p class="conformance-level">AA</p>
 
-   <p>Any keyboard operable user interface has a mode of operation where the keyboard <a>focus indicator</a> is visible.
+   <p>Any keyboard operable user interface has a mode of operation where the keyboard focus indicator is visible.
    </p>
 
 </section>