Documentation/releases: Add payload notes for 4.17 release

Add notes for significant changes to payloads, such as new payloads and
version updates.

Change-Id: I607d732beee07396a8002e5e504375d9dc4d7eda
Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64752
Reviewed-by: Felix Singer <felixsinger@posteo.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/Documentation/releases/coreboot-4.17-relnotes.md b/Documentation/releases/coreboot-4.17-relnotes.md
index 30a5835..bb55d7f 100644
--- a/Documentation/releases/coreboot-4.17-relnotes.md
+++ b/Documentation/releases/coreboot-4.17-relnotes.md
@@ -28,4 +28,14 @@
 This reason for this change is improved flexibility with regards to which
 stage initializes cbmem.
 
+### Payloads
+* SeaBIOS: Update stable release from 1.14.0 to 1.16.0
+* iPXE: Update stable release from 2019.3 to 2022.1
+* Add new coreDOOM payload, a port of Doom to libpayload
+* Add "GRUB2 atop SeaBIOS" aka "SeaGRUB" option, which builds GRUB2 as a
+  secondary payload for SeaBIOS with the GRUB2 set as the default boot entry.
+  This allows GRUB2 to use BIOS callbacks provided by SeaBIOS as a fallback
+  method to access hardware that the native GRUB2 payload cannot access.
+* Add option to build SeaBIOS and GRUB2 as secondary payloads
+
 ### Add significant changes here