Add: release note

Author: hassaanelgarem

RELEASE-NOTES.txt

@@ -9,6 +9,7 @@
 * [**] [Jetpack-only] Jetpack individual plugin support: Warns user about sites with only individual plugins not supporting all features of the app yet and gives the ability to install the full Jetpack plugin. [#20223]
 * [**] [Jetpack-only] Help: Display the Jetpack app FAQ card on Help screen when switching from the WordPress app to the Jetpack app is complete. [#20232]
 * [***] [Jetpack-only] Blaze: We added support for Blaze in the app. The user can now promote a post or page from the app to reach new audiences. [#20253]
+* [**] [internal] Fixes a crash that happens in the background when the weekly roundup notification is being processed. [#20275]
 
 21.8
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