link aod500 in spectrum.rst

Author: RDaxini

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

@@ -65,7 +65,7 @@ Reference [2]_.
 |                                                     +-----------------------------+   ✓     |         |  ✓   |  ✓   |  ✓   |            +   [5]_    |
 |                                                     | :term:`airmass_absolute`,   |         |         |      |      |      |            |           |
 |                                                     +-----------------------------+         |         |      |      |      |            |           |
-|                                                     | aod500,                     |         |         |      |      |      |            |           |
+|                                                     | :term:`aod500`              |         |         |      |      |      |            |           |
 |                                                     +-----------------------------+         |         |      |      |      |            |           |
 |                                                     | :term:`aoi`,                |         |         |      |      |      |            |           |
 |                                                     +-----------------------------+         |         |      |      |      |            |           |