Clarify animation saving

Co-authored-by: Thomas A Caswell <[email protected]>

Author: dstansby

doc/api/animation_api.rst

@@ -32,7 +32,7 @@ to.  If you do not hold a reference to the `Animation` object, it (and
 hence the timers) will be garbage collected which will stop the
 animation.
 
-To save an animation to disk use `Animation.save`, `Animation.to_html5_video`,
+To save an animation use `Animation.save`, `Animation.to_html5_video`,
 or `Animation.to_jshtml`.
 
 See :ref:`ani_writer_classes` below for details about what movie formats are