[LoongArch] Summary clang22 release notes

clang/docs/ReleaseNotes.rst

diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 0bec56b..2e5c156d 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -733,6 +733,10 @@
 ^^^^^^^^^^^^^^^^^
 - Enable linker relaxation by default for loongarch64.
 
+- Introduce LASX and LSX conversion intrinsics.
+
+- `__attribute__((target("lasx")))` now implies the `lsx` feature.
+
 - DWARF fission is now compatible with linker relaxations, allowing `-gsplit-dwarf` and `-mrelax`
   to be used together when building for the LoongArch platform.