DOC: fix markup

Co-authored-by: Elliott Sales de Andrade <[email protected]>

Author: tacaswell

lib/matplotlib/animation.py

@@ -1457,7 +1457,7 @@ class ArtistAnimation(TimedAnimation):
     fig : `~matplotlib.figure.Figure`
         The figure object used to get needed events, such as draw or resize.
     artists : list
-        Each list entry is a collection of `Artist` objects that are made
+        Each list entry is a collection of `.Artist` objects that are made
         visible on the corresponding frame.  Other artists are made invisible.
     interval : int, default: 200
         Delay between frames in milliseconds.