fix spelling typos in a couple of places

responsive/index.html

@@ -476,7 +476,7 @@ <h2>UndoRequest</h2>
                     <section>
                         <h2>The Twist</h2>
                         <p class="fragment">Unfortunately, IndieUI is not really supported yet</p>
-						<p class="fragment"><strong>For now, just be congnizant of the variety...</strong></p>
+						<p class="fragment"><strong>For now, just be cognizant of the variety...</strong></p>
 						<p>
 							<em class="fragment">Not everyone has hover state</em>
 							<br>
@@ -726,7 +726,7 @@ <h2>Layout-oriented Libraries</h2>
 						<br><a href="http://getskeleton.com/" target="_blank">getskeleton.com</a></p>
 						<p class="fragment"><strong>Responsive Grid System</strong><br><a href="http://responsive.gs/" target="_blank">responsive.gs</a></p>
 						<p class="fragment"><strong>Toast</strong><br><a href="http://daneden.github.io/Toast/" target="_blank">daneden.github.io/Toast</a></p>
-						<p class="fragment"><strong>Grid Syle Sheets *</strong><br><a href="http://gridstylesheets.org/" target="_blank">gridstylesheets.org</a><br><em style="font-size: 20px;line-height:20px;">* Not actually CSS but rather a language based on the Cassowary Constraint Solver</em>
+						<p class="fragment"><strong>Grid Style Sheets *</strong><br><a href="http://gridstylesheets.org/" target="_blank">gridstylesheets.org</a><br><em style="font-size: 20px;line-height:20px;">* Not actually CSS but rather a language based on the Cassowary Constraint Solver</em>
 					</section>
 
 					<section>