Updates: RELEASE-NOTES.txt after merge

Author: AjeshRPai

RELEASE-NOTES.txt

@@ -3,7 +3,6 @@
 21.0
 -----
 * [***] [internal] Updates the target sdk to 31 - Android 12 [https://github.com/wordpress-mobile/WordPress-Android/pull/17153]
-
 * [***] Updated About screen for WordPress and Jetpack apps to their respective urls. [https://github.com/wordpress-mobile/WordPress-Android/pull/17282]
 * [*] Updates splash screen for Android 12+ [https://github.com/wordpress-mobile/WordPress-Android/pull/17273]
 * [*] Fix text color of success messages in the QR code login flow [https://github.com/wordpress-mobile/WordPress-Android/pull/17286]