typo fix in component docs

docs/components.html

@@ -1278,7 +1278,7 @@
           </div>
           <div class="span4">
             <h3>Browser support</h3>
-            <p>Progress bars use CSS3 gradients, transitions, and animations to achieve all theire effects. These features are not supported in IE7-8 or older versions of Firefox.</p>
+            <p>Progress bars use CSS3 gradients, transitions, and animations to achieve all their effects. These features are not supported in IE7-8 or older versions of Firefox.</p>
             <p>Opera does not support animations at this time.</p>
           </div>
         </div>