Update docs.

docs/reference/utils/colors.rst

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+.. _colors:
+
+Colors
+------------
+
+.. automodule:: pyrad.utils.colors
+   :members:
+   :show-inheritance:

docs/reference/utils/index.rst

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+.. _utils:
+
+Utils
+===================
+
+.. toctree::
+
+   colors
+   math
+   visualization

docs/reference/utils/math.rst

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+.. _math:
+
+Math
+============
+
+.. automodule:: pyrad.utils.math
+   :members:
+   :show-inheritance:

docs/reference/utils/visualization.rst

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+.. _visualization:
+
+Visualization
+----------------
+
+.. automodule:: pyrad.utils.visualization
+   :members:
+   :show-inheritance: