Update spectrum.rst

Author: RDaxini

docs/sphinx/source/user_guide/modeling_topics/spectrum.rst

@@ -51,15 +51,15 @@ Reference [2]_.
 |                                                     +-----------------------------+         |         |      |      |      |            |           |
 |                                                     |:term:`precipitable_water`,  |   ✓     |    ✓    |  ✓   |   ✓  |  ✓   |     ✓      |   [2]_    |
 |                                                     +-----------------------------+         |         |      |      |      |            |           |
-|                                                     | aod                         |         |         |      |      |      |            |           |
+|                                                     | :term:`aod`                 |         |         |      |      |      |            |           |
 +-----------------------------------------------------+-----------------------------+---------+---------+------+------+------+------------+-----------+
 | :py:func:`First Solar <spectral_factor_firstsolar>` | :term:`airmass_absolute`,   |         |         |      |      |      |            |           |
 |                                                     +-----------------------------+         |    ✓    |  ✓   |      |      |            |   [3]_    |
 |                                                     | :term:`precipitable_water`  |         |         |      |      |      |            |           |
 +-----------------------------------------------------+-----------------------------+---------+---------+------+------+------+------------+-----------+
 | :py:func:`JRC <spectral_factor_jrc>`                | :term:`airmass_relative`,   |         |         |      |      |      |            |           |
 |                                                     +-----------------------------+         |    ✓    |  ✓   |      |      |            +   [4]_    |
-|                                                     | clearsky_index              |         |         |      |      |      |            |           |
+|                                                     | :term:`clearsky_index`      |         |         |      |      |      |            |           |
 +-----------------------------------------------------+-----------------------------+---------+---------+------+------+------+------------+-----------+
 | :py:func:`Polo <spectral_factor_polo>`              | :term:`precipitable_water`, |         |         |      |      |      |            |           |
 |                                                     +-----------------------------+   ✓     |         |  ✓   |  ✓   |  ✓   |            +   [5]_    |