update STT release note, add missing so-SO, cy-GB

Author: fezuo

articles/cognitive-services/Speech-Service/includes/release-notes/release-notes-stt.md

@@ -9,12 +9,14 @@ ms.author: eur
 
 #### New Speech-to-text-locales:
 
-Added 2 new locales as shown in the following table. See the complete language list [here](../../language-support.md).
+Added 4 new locales as shown in the following table. See the complete language list [here](../../language-support.md).
 
 | Locale  | Language                          |
 |---------|-----------------------------------|
 | `bs-BA`         | Bosnian (Bosnia and Herzegovina)  |
 | `ps-AF`         | Pashto (Afghanistan)              |
+| `so-SO`         | Somali (Somalia)              |
+| `cy-GB`         | Welsh (United Kingdom)              |
 
 
 ### 2022-Jun release