CB:41612 added a new set of tools for generating SPDs for TGL and JSL based mainboards. This change adds relevant documentation to coreboot-4.13 release notes. Change-Id: I168adad25df9195dec64e8104f2dbe992eebddc6 Signed-off-by: Furquan Shaikh <furquan@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/42092 Reviewed-by: Karthik Ramasubramanian <kramasub@google.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>