relocate inheritance digram to the top of the document

Author: lgfunderburk

doc/api/animation_api.rst

@@ -2,6 +2,14 @@
 ``matplotlib.animation``
 ************************
 
+.. inheritance-diagram:: matplotlib.animation.FuncAnimation matplotlib.animation.ArtistAnimation
+   :private-bases:
+   :parts: 1
+
+.. inheritance-diagram:: matplotlib.animation.FFMpegFileWriter matplotlib.animation.FFMpegWriter matplotlib.animation.ImageMagickFileWriter matplotlib.animation.ImageMagickWriter
+   :private-bases:
+   :parts: 1
+
 .. automodule:: matplotlib.animation
    :no-members:
    :no-undoc-members:
@@ -289,13 +297,3 @@ are provided.
 
 See the source code for how to easily implement new `MovieWriter` classes.
 
-Inheritance Diagrams
-====================
-
-.. inheritance-diagram:: matplotlib.animation.FuncAnimation matplotlib.animation.ArtistAnimation
-   :private-bases:
-   :parts: 1
-
-.. inheritance-diagram:: matplotlib.animation.FFMpegFileWriter matplotlib.animation.FFMpegWriter matplotlib.animation.ImageMagickFileWriter matplotlib.animation.ImageMagickWriter
-   :private-bases:
-   :parts: 1