Fix examples

src/lib.rs

@@ -12,9 +12,9 @@
 //!                                          None);
 //!     // Show the notification
 //!     n.show().unwrap();
-//!     // You can also use the .show() convenience method on the context
+//!     // Update the existent notification
 //!     n.update("I am another notification", None, None).unwrap();
-//!     // Show the update notification
+//!     // Show the updated notification
 //!     n.show().unwrap();
 //!     // We are done, deinit
 //!     libnotify::uninit();