chore(changelog): add MMDS tcp option length entry

Add new entry for the MMDS TCP option length fix

Signed-off-by: Jack Thomson <jackabt@amazon.com>

Author: JackThomson2

CHANGELOG.md

@@ -67,6 +67,8 @@ and this project adheres to
   bug that caused Firecracker to corrupt the memory files of differential
   snapshots for VMs with multiple memory slots. This affected VMs using memory
   hot-plugging or any x86 VMs with a memory size larger than 3GiB.
+- [#5739](https://github.com/firecracker-microvm/firecracker/pull/5739): Fixed
+  validation of TCP SYN options length when MMDS is enabled.
 
 ## [v1.14.0]