CHANGELOG: Add entries related to tracing

Signed-off-by: George Dunlap <george.dunlap@cloud.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Release-Acked-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>

CHANGELOG.md

@@ -21,6 +21,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
  - When building with Systemd support (./configure --enable-systemd), remove
    libsystemd as a build dependency.  Systemd Notify support is retained, now
    using a standalone library implementation.
+ - xenalyze no longer requires `--svm-mode` when analyzing traces
+   generated on AMD CPUs
 
 ### Added
  - On x86:
@@ -37,6 +39,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
    compatibility reasons.  VMs configured with bootloader="/usr/bin/pygrub"
    should be updated to just bootloader="pygrub".
  - The Xen gdbstub on x86.
+ - xentrace_format has been removed; use xenalyze instead.
 
 ## [4.18.0](https://xenbits.xenproject.org/gitweb/?p=xen.git;a=shortlog;h=RELEASE-4.18.0) - 2023-11-16