Fix Fourier example images not building in documentation

pymc_marketing/mmm/fourier.py

@@ -70,10 +70,24 @@
 
 Plot the prior fourier seasonality trend.
 
-.. code-block:: python
+.. plot::
+    :context: close-figs
 
+    import pandas as pd
+    import pymc as pm
     import matplotlib.pyplot as plt
 
+    from pymc_marketing.mmm import YearlyFourier
+
+    yearly = YearlyFourier(n_order=3)
+
+    dates = pd.date_range("2023-01-01", periods=52, freq="W-MON")
+
+    dayofyear = dates.dayofyear.to_numpy()
+
+    with pm.Model() as model:
+        fourier_trend = yearly.apply(dayofyear)
+
     prior = yearly.sample_prior()
     curve = yearly.sample_curve(prior)
     yearly.plot_curve(curve)
@@ -107,10 +121,23 @@
 
 All the plotting will still work! Just pass any coords.
 
-.. code-block:: python
+.. plot::
+    :context: close-figs
 
     import matplotlib.pyplot as plt
 
+    from pymc_marketing.mmm import YearlyFourier
+    from pymc_extras.prior import Prior
+
+    # "fourier" is the default prefix!
+    prior = Prior(
+        "Laplace",
+        mu=Prior("Normal", dims="fourier"),
+        b=Prior("HalfNormal", sigma=0.1, dims="fourier"),
+        dims=("fourier", "hierarchy"),
+    )
+    yearly = YearlyFourier(n_order=3, prior=prior)
+
     coords = {"hierarchy": ["A", "B", "C"]}
     prior = yearly.sample_prior(coords=coords)
     curve = yearly.sample_curve(prior)