DOCSP-30819: beta -> preview in release notes (#605)

Author: jwilliams-mongo

source/release-notes.txt

@@ -450,7 +450,7 @@ Improvements in this release:
 - `Charts Embedding SDK <https://github.com/mongodb-js/charts-embed-sdk>`__ 
   has been updated to v2.1.0 to support programmatic highlighting. 
 
-- :ref:`Click Events <handle-click-events>` are no longer in beta.
+- :ref:`Click Events <handle-click-events>` are no longer in Preview.
 
 Bug fixes in this release:
 
@@ -608,7 +608,7 @@ Improvements in this release:
 - Adds the option to select the angle for labels on the X-axis of 
   discrete charts.
 
-- Extends the Embedding :ref:`Click Events <handle-click-events>` beta 
+- Extends the Embedding :ref:`Click Events <handle-click-events>` Preview 
   to include Table chart types.
 
 - Developers can now filter click events by role.
@@ -655,7 +655,7 @@ Improvements in this release:
   :ref:`100% stacked charts <column-bar-chart-ref>` now show percentage
   as well as raw value.
 
-- Extends embedding :ref:`Click Events <handle-click-events>` beta to
+- Extends embedding :ref:`Click Events <handle-click-events>` Preview to
   support geospatial chart types and to include ``selectionFilter``
   attribute.
 
@@ -721,7 +721,7 @@ Improvements in this release:
   and Stacked Column <column-bar-chart-ref>` charts.
 - Improves rendering performance on embedded charts.
 - Releases Click Events in the `Charts Embedding SDK
-  <https://github.com/mongodb-js/charts-embed-sdk>`__ as a beta feature. 
+  <https://github.com/mongodb-js/charts-embed-sdk>`__ as a Preview feature. 
 
 Bugs fixed in this release:
 
@@ -1281,7 +1281,7 @@ Improvements in this release:
 - Adds :ref:`dashboard filtering <dashboard-filtering>` for
   authenticated dashboard users.
 
-- Adds support for Embedding JavaScript SDK (beta) for unauthenticated
+- Adds support for Embedding JavaScript SDK (Preview) for unauthenticated
   embedding.
 
 - IFrame :ref:`embedded charts <embedding-charts>` no longer require