Fix spelling error.

Author: thomasmchen

widgets.html

@@ -104,8 +104,8 @@ <h3>Installation</h3>
             </span>
           </div>
           <p>
-          A 2-D interative data visualization library implementing the
-          constructs of the grammar of graphics. bqplot provides a simple
+          A 2-D interactive data visualization library implementing the
+          constructs of the grammar of graphics, bqplot provides a simple
           API for creating custom user interactions.
           </p>
           <h3>Example</h3>