Use raw mode for docstring

This avoids troubles due to the escape characters contained in this docstring.

Author: gagern

src/sage/plot/animate.py

@@ -929,7 +929,7 @@ def apng(self, savefile=None, show_path=False, delay=20, iterations=0):
             print "Animation saved to file %s." % savefile
 
     def save(self, filename=None, show_path=False, use_ffmpeg=False, **kwds):
-        """
+        r"""
         Save this animation.
 
         INPUT: