LP#1831786 (follow-up): release note for cross-tab communication demo

Signed-off-by: Jane Sandberg <sandbej@linnbenton.edu>

diff --git a/docs/RELEASE_NOTES_NEXT/Client/ang-crosstab-communication.adoc b/docs/RELEASE_NOTES_NEXT/Client/ang-crosstab-communication.adoc
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+Cross-Tab Communication Demo
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+The Angular Sandbox now includes an example
+for developers interested in sharing data
+between staff client browser tabs.
+