DOC: colorbar may steal from array of axes

[rcomer]

PR Summary

Small docstring correction. make_axes specifically handles numpy arrays

matplotlib/lib/matplotlib/colorbar.py

Lines 1391 to 1392 in fd5cf5c

	if isinstance(parents, np.ndarray):
	parents = list(parents.flat)

and there is an example in the Constrained Layout Guide where a 2D array of Axes is passed.

PR Checklist

Tests and Styling

• [N/A] Has pytest style unit tests (and pytest passes).
• Is Flake 8 compliant (install flake8-docstrings and run flake8 --docstring-convention=all).

Documentation

• [N/A] New features are documented, with examples if plot related.
• [N/A] New features have an entry in doc/users/next_whats_new/ (follow instructions in README.rst there).
• [N/A] API changes documented in doc/api/next_api_changes/ (follow instructions in README.rst there).
• Documentation is sphinx and numpydoc compliant (the docs should build without error).