Fix a small typo (#9997)

Author: sanderboom

src/components/input/input.js

@@ -296,7 +296,7 @@ function labelDirective() {
  * - The textarea's height gets set on initialization, as well as while the user is typing. In certain situations
  * (e.g. while animating) the directive might have been initialized, before the element got it's final height. In
  * those cases, you can trigger a resize manually by broadcasting a `md-resize-textarea` event on the scope.
- * - If you wan't a `textarea` to stop growing at a certain point, you can specify the `max-rows` attribute.
+ * - If you want a `textarea` to stop growing at a certain point, you can specify the `max-rows` attribute.
  * - The textarea's bottom border acts as a handle which users can drag, in order to resize the element vertically.
  * Once the user has resized a `textarea`, the autogrowing functionality becomes disabled. If you don't want a
  * `textarea` to be resizeable by the user, you can add the `md-no-resize` attribute.