[docs] Add clang/llvm release notes for mipsel-windows-* targets

Author: hpoussin

clang/docs/ReleaseNotes.rst

@@ -991,6 +991,8 @@ Windows Support
   extensions are enabled. This allows for properly processing ``intsafe.h`` in
   the Windows SDK.
 
+- Clang now supports `mipsel-windows-gnu` and `mipsel-windows-msvc` targets.
+
 LoongArch Support
 ^^^^^^^^^^^^^^^^^
 

llvm/docs/ReleaseNotes.md

@@ -150,6 +150,7 @@ Changes to the MIPS Backend
 ---------------------------
 
 * `-mcpu=i6400` and `-mcpu=i6500` were added.
+* Added support for `mipsel-windows-gnu` and `mipsel-windows-msvc` targets.
 
 Changes to the PowerPC Backend
 ------------------------------
@@ -222,6 +223,7 @@ Changes to the Windows Target
 
 * `fp128` is now passed indirectly, meaning it uses the same calling convention
   as `i128`.
+* Added support for `mipsel-windows-gnu` and `mipsel-windows-msvc` targets.
 
 Changes to the X86 Backend
 --------------------------