Fix typo in index.html - ease-elastic-out-3 (#516)

docsite/index.html

@@ -2578,7 +2578,7 @@ <h5>Ease Elastic Out</h5>
           <div class="ease-demo paused">
             <div style="animation-timing-function: var(--ease-elastic-out-1)">ease-elastic-out-1</div>
             <div style="animation-timing-function: var(--ease-elastic-out-2)">ease-elastic-out-2</div>
-            <div style="animation-timing-function: var(--etic-elastic-out-3)">ease-elastic-out-3</div>
+            <div style="animation-timing-function: var(--ease-elastic-out-3)">ease-elastic-out-3</div>
             <div style="animation-timing-function: var(--ease-elastic-out-4)">ease-elastic-out-4</div>
             <div style="animation-timing-function: var(--ease-elastic-out-5)">ease-elastic-out-5</div>
           </div>