[Hexagon] Add release note for LLVM 16

Krzysztof Parzyszek · Krzysztof Parzyszek · commit 140bc411b245 · 2023-02-07T09:25:21.000-08:00
diff --git a/llvm/docs/ReleaseNotes.rst b/llvm/docs/ReleaseNotes.rst
@@ -86,7 +86,7 @@ Changes to the DirectX Backend
 Changes to the Hexagon Backend
 ------------------------------
 
-* ...
+* The Hexagon backend now support V71 and V73 ISA.
 
 Changes to the LoongArch Backend
 --------------------------------
