Apply suggestions from code review

Co-authored-by: Thomas A Caswell <tcaswell@gmail.com>

doc/api/animation_api.rst

@@ -142,22 +142,22 @@ function. ::
    from functools import partial
 
    fig, ax = plt.subplots()
-   ln, = plt.plot([], [], 'ro')
+   line1, = plt.plot([], [], 'ro')
 
    def init():
        ax.set_xlim(0, 2*np.pi)
        ax.set_ylim(-1, 1)
        return ln,
 
-   def update(frame, x, y):
+   def update(frame, ln, x, y):
        x.append(frame)
        y.append(np.sin(frame))
        ln.set_data(xdata, ydata)
        return ln,
 
    xdata, ydata = [], []
    ani = FuncAnimation(
-       fig, partial(update, x=xdata, y=ydata),
+       fig, partial(update, ln=line1, x=xdata, y=ydata),
        frames=np.linspace(0, 2 * np.pi, 128),
        init_func=init, blit=True)
 

lib/matplotlib/animation.py

@@ -1533,10 +1533,10 @@ def func(frame, *fargs) -> iterable_of_artists
         arguments, set all arguments as keyword arguments, just leaving the
         *frame* argument unset::
 
-            def func(frame, x, *, y=None):
+            def func(frame, art, *, y=None):
                 ...
 
-            ani = FuncAnimation(fig, partial(func, x=1, y='foo'))
+            ani = FuncAnimation(fig, partial(func, art=ln, y='foo'))
 
         If ``blit == True``, *func* must return an iterable of all artists
         that were modified or created. This information is used by the blitting