Remove suggestion to delete animation.

It turns out deleting animations is ... complicated?
An animation that has .teardown called doesn't need to be destroyed.
It seems that there is unschedule and destroy that ... need to be
called depending on if the animation has been scheduled yet?

None of the other examples cover destroying, so remove it from here.

Author: a1291762

source/_guides/graphics-and-animations/animations.md

@@ -199,15 +199,8 @@ animation_set_duration(s_animation, 1000);
 // Create the AnimationImplementation
 animation_set_implementation(s_animation, &s_implementation);
 
-...
-
 // Play the Animation
 animation_schedule(s_animation);
-
-...
-
-// Destroy the animation
-animation_destroy(s_animation);
 ```
 
 The output of the example above will look like the snippet shown below (edited