update the changes docs

Author: geordie666

doc/changes.rst

@@ -5,6 +5,7 @@ desidatamodel Change Log
 23.6 (unreleased)
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+* Add 5 coadd-related columns to the fibermap of the Redrock files (PR `#192`_).
 * Add ``DESINAME`` description (PR `#189`_).
 * Update definition of ``ZCAT_NSPEC`` (PR `#187`_).
 * Add note about equivalent width values in ``fuji`` and ``guadalupe`` (PR `#181`_).
@@ -14,6 +15,7 @@ desidatamodel Change Log
 .. _`#181`: https://github.com/desihub/desidatamodel/pull/181
 .. _`#187`: https://github.com/desihub/desidatamodel/pull/187
 .. _`#189`: https://github.com/desihub/desidatamodel/pull/189
+.. _`#192`: https://github.com/desihub/desidatamodel/pull/192
 
 23.1 (2023-06-12)
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