Fix typo in v1.11 release notes

Author: jeff-allen-mongo

source/release-notes.txt

@@ -20,7 +20,7 @@ Improvements in this release:
 - Allows setting the ``theme`` and ``attribution`` with the
   :ref:`Embedding SDK <embedding-charts-sdk>`.
 
-- Adds :ref:`Gauge Chart <gauge-chart-ref>` type.
+- Adds the :ref:`Gauge Chart <gauge-chart-ref>` type.
 
 - Enables :ref:`Dashboard filters <dashboard-filtering>` on public
   link-shared dashboards.