DOC: call out numpy array specifically

We support higher-dimensional arrays (not clear we _should_ but we do).

Author: tacaswell

lib/matplotlib/colorbar.py

@@ -1394,7 +1394,7 @@ def make_axes(parents, location=None, orientation=None, fraction=0.15,
 
     Parameters
     ----------
-    parents : `~.axes.Axes` or iterable of `~.axes.Axes`
+    parents : `~.axes.Axes` or iterable or `numpy.ndarray` of `~.axes.Axes`
         The Axes to use as parents for placing the colorbar.
     %(_make_axes_kw_doc)s
 

lib/matplotlib/figure.py

@@ -1195,7 +1195,7 @@ def colorbar(
         cax : `~matplotlib.axes.Axes`, optional
             Axes into which the colorbar will be drawn.
 
-        ax : `~.axes.Axes` or iterable of Axes, optional
+        ax : `~.axes.Axes` or iterable or `numpy.ndarray` of Axes, optional
             One or more parent axes from which space for a new colorbar axes
             will be stolen, if *cax* is None.  This has no effect if *cax* is
             set.