Add release note

Author: vogelsgesang

llvm/docs/ReleaseNotes.md

@@ -140,6 +140,10 @@ Changes to LLDB
   Therefore current implementation allows only 1 watchpoint, as tested with
   Windows 11 on the Microsoft SQ2 and Snapdragon Elite X platforms.
 
+### Changes to lldb-dap
+
+* Breakpoints can now be set for specific columns within a line.
+
 Changes to BOLT
 ---------------------------------