DOCSP-33352 Removes duplicate release note entry from 1.6 (#165)

Author: kennethdyer

source/release-notes/1.6.txt

@@ -37,14 +37,6 @@ with the ``databaseRegex`` and ``collectionRegex`` fields.
 
 For more information, see :ref:`c2c-filter-regex`.
 
-Exclusion Filters
-~~~~~~~~~~~~~~~~~
-
-Starting in 1.6.0, the :ref:`c2c-api-start` API endpoint now supports the
-use of exclusion filters through the ``excludeNamespaces`` parameter.
-
-For more information, see :ref:`c2c-filtered-sync`.
-
 7.0 Support
 ~~~~~~~~~~~