Added an example to demonstrate canvas text.

examples/index.html

@@ -67,6 +67,7 @@
 			<li><a href="image/index.html">Plotting prerendered images</a> (with image plugin)</li>
 			<li><a href="series-errorbars/index.html">Plotting error bars</a> (with errorbars plugin)</li>
 			<li><a href="series-pie/index.html">Pie charts</a> (with pie plugin)</li>
+			<li><a href="canvas/index.html">Rendering text with canvas instead of HTML</a> (with canvas plugin)</li>
 		</ul>
 
 	</div>