docs/releases: Add 4.22 release notes template

Add 4.22 template and update index.

Change-Id: Id44616ca70ba693fc622164469bb748ee269565b
Signed-off-by: Jason Glenesk <jason.glenesk@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77277
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

Documentation/releases/coreboot-4.22-relnotes.md

@@ -0,0 +1,54 @@
+Upcoming release - coreboot 4.22
+========================================================================
+
+The 4.22 release is planned for mid-November, 2023
+
+Update this document with changes that should be in the release notes.
+
+* Please use Markdown.
+* See the past few release notes for the general format.
+* The chip and board additions and removals will be updated right
+  before the release, so those do not need to be added.
+* Note that all changes before the release are done are marked upcoming.
+  A final version of the notes are done after the release.
+
+### Significant or interesting changes
+----------------------------------
+
+* Add changes that need a full description here
+
+* This section should have full descriptions and can or should have
+  a link to the referenced commits.
+
+### Toolchain updates
+
+* To be filled in immediately before the release by the release team
+
+### Additional coreboot changes
+---------------------------
+
+The following are changes across a number of patches, or changes worth
+noting, but not needing a full description.
+
+* Changes that only need a line or two of description go here.
+
+### Platform Updates
+----------------
+
+* To be filled in immediately before the release by the release team
+
+### Plans to move platform support to a branch
+------------------------------------------
+
+* Section to be filled in or removed after discussion
+
+### Statistics from the 4.21 to the 4.22 release
+--------------------------------------------
+
+* To be filled in immediately before the release by the release team
+
+
+### Significant Known and Open Issues
+---------------------------------
+
+* To be filled in immediately before the release by the release team

Documentation/releases/index.md

@@ -3,7 +3,7 @@
 ## Upcoming release
 
 Please add to the release notes as changes are added:
-* [4.21 - August 2023](coreboot-4.21-relnotes.md)
+* [4.22 - November 2023](coreboot-4.22-relnotes.md)
 
 The [checklist] contains instructions to ensure that a release covers all
 important things and provides a reliable format for tarballs, branch
@@ -15,6 +15,7 @@ important is taken care of.
 
 ## Previous releases
 
+* [4.21   - August 2023](coreboot-4.21-relnotes.md)
 * [4.20.1 - May 2023](coreboot-4.20.1-relnotes.md)
 * [4.19   - January 2023](coreboot-4.19-relnotes.md)
 * [4.18   - October 2022](coreboot-4.18-relnotes.md)