Update releasenotes.md

Author: sally-baolian

articles/cognitive-services/Speech-Service/releasenotes.md

@@ -21,7 +21,7 @@ See below for information about changes to Speech services and resources.
 
 * Speech SDK 1.23.0 and Speech CLI 1.23.0 were released in July 2022. See details below.
 * Custom speech-to-text container v3.1.0 released in March 2022, with support to get display models.
-* TTS Service March 2022, public preview of Cheerful and Sad styles with fr-FR-DeniseNeural.
+* TTS Service July 2022, new voices in Public Preview and new viseme feature blend shapes were released. See details below.
 
 ## Release notes