doc(changelog): link PR for pmem snapshot override entry

Signed-off-by: MohibShaikh <mohibuddin9@gmail.com>

Author: MohibShaikh

CHANGELOG.md

@@ -10,7 +10,8 @@ and this project adheres to
 
 ### Added
 
-- Add support for overriding virtio-pmem device backing file paths on snapshot
+- [#5896](https://github.com/firecracker-microvm/firecracker/pull/5896): Add
+  support for overriding virtio-pmem device backing file paths on snapshot
   restore via the new `pmem_overrides` field on the `PUT /snapshot/load` API.
   This mirrors the existing network and vsock override mechanisms and is useful
   when the host file path baked into the snapshot is no longer valid (for