Add release note for WoA HW Watch support

Author: omjavaid

llvm/docs/ReleaseNotes.md

@@ -135,6 +135,10 @@ Changes to LLDB
 
 * When building LLDB with Python support, the minimum version of Python is now
   3.8.
+* LLDB now supports hardware watchpoints for AArch64 Windows targets. Windows
+  does not provide API to query the number of supported hardware watchpoints.
+  Therefore current implementation allows only 1 watchpoint, as tested with
+  Windows 11 on the Microsoft SQ2 and Snapdragon Elite X platforms.
 
 Changes to BOLT
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