Typo fix on button page (#1158)

"Meant to look an behave" -> "Meant to look and behave"

docs/documentation/elements/button.html

@@ -421,7 +421,7 @@ variables:
 
     <div class="content">
       <p>
-        The <strong>button</strong> is an essential element of any design. It's meant to look an behave as an <strong>interactive</strong> element of your page.
+        The <strong>button</strong> is an essential element of any design. It's meant to look and behave as an <strong>interactive</strong> element of your page.
       </p>
     </div>