DOCSP-46474: Remove link to deprecated operator (#85)

(cherry picked from commit 801d49d)

Author: mcmorisi

source/reference/associations.txt

@@ -710,7 +710,6 @@ The following operators are supported:
 - :manual:`$regex </reference/operator/query/regex/>` (``$options`` field
   is only supported when the ``$regex`` argument is a string)
 - :manual:`Bitwise operators </reference/operator/query-bitwise/>`
-- :manual:`$comment </reference/operator/query/comment/>`
 
 For example, using the model definitions just given, we could query
 tours on a loaded band: