[llvm] [lldb] Add release note about ELF `thread siginfo` and negative SI Codes. (PR #141631)

[David Spickett via llvm-commits]

================
@@ -279,6 +279,12 @@ Changes to LLDB
   supporting reverse execution, such as [rr](https://rr-project.org).
   When using reverse execution, `process continue --forward` returns to the
   forward execution.
+* LLDB now supports siginfo descriptions for user-space signals. User space
----------------
DavidSpickett wrote:

user-space signals - on Linux, right? Be as specific as you can be.

https://github.com/llvm/llvm-project/pull/141631