Add focus classes to Example Links Docs page

Author: donnieberg

src/templates/docs/links/index.html

@@ -45,11 +45,11 @@ <h4 class="f4 mv0 fw6 dib mr4"><%= name %></h4>
 <div class="ph3 ph5-ns pt4 pb5">
   <h2 class="f3 bold">Examples</h2>
   <p>
-    <a href="#" class="db b link pv1 hover-gray black">Black link</a>
-    <a href="#" class="db b link pv1 hover-black near-black">Near-black link</a>
-    <a href="#" class="db b link pv1 hover-black dark-gray">Dark-gray link</a>
-    <a href="#" class="db b link pv1 hover-black mid-gray">Mid-gray link</a>
-    <a href="#" class="db b link pv1 hover-black gray">Gray link</a>
+    <a href="#" class="db b link pv1 hover-gray focus-gray black">Black link</a>
+    <a href="#" class="db b link pv1 hover-black focus-black near-black">Near-black link</a>
+    <a href="#" class="db b link pv1 hover-black focus-black dark-gray">Dark-gray link</a>
+    <a href="#" class="db b link pv1 hover-black focus-black mid-gray">Mid-gray link</a>
+    <a href="#" class="db b link pv1 hover-black focus-black gray">Gray link</a>
   </p>
   <div class="mt5 cf">
     <div class="dib mr4">