Update answers to reflect that we are now using Fedora's GRUB patches

Signed-off-by: James Le Cuirot <jlecuirot@microsoft.com>

README.md

@@ -125,7 +125,7 @@ No, our boot stack is not NX bit compatible.
 ### What exact implementation of Secure Boot in GRUB2 do you have? (Either Upstream GRUB2 shim_lock verifier or Downstream RHEL/Fedora/Debian/Canonical-like implementation)
 Skip this, if you're not using GRUB2.
 *******************************************************************************
-Upstream GRUB 2.12. Some patches are applied, but only to other parts of GRUB.
+Fedora's GRUB 2.12. Two additional patches are applied, one for enhanced GPT functionality, and one to read the verity hash from within the kernel image.
 
 *******************************************************************************
 ### Do you have fixes for all the following GRUB2 CVEs applied?
@@ -281,7 +281,7 @@ shim.flatcar,1,Flatcar Container Linux,shim,15.8-r1,security@flatcar-linux.org
 
 sbat,1,SBAT Version,sbat,1,https://github.com/rhboot/shim/blob/main/SBAT.md
 grub,4,Free Software Foundation,grub,2.12,https://www.gnu.org/software/grub/
-grub.flatcar,1,Flatcar,grub2,2.12-flatcar1,https://github.com/flatcar/flatcar
+grub.flatcar,1,Flatcar,grub2,2.12-flatcar3,https://github.com/flatcar/flatcar
 ```
 We do not provide with fwupd, fwupdate, and systemd-boot.
 
@@ -322,7 +322,7 @@ We don't use systemd-boot.
 *******************************************************************************
 ### What is the origin and full version number of your bootloader (GRUB2 or systemd-boot or other)?
 *******************************************************************************
-[Upstream GRUB 2.12](https://www.gnu.org/software/grub/) with [Gentoo patches](https://github.com/flatcar/scripts/tree/main/sdk_container/src/third_party/portage-stable/sys-boot/grub/files) and [Flatcar patches](https://github.com/flatcar/scripts/tree/main/sdk_container/src/third_party/coreos-overlay/coreos/user-patches/sys-boot/grub). Together, these form version `2.12-flatcar1`. This is shown in user-visible parts of GRUB.
+[Upstream GRUB 2.12](https://www.gnu.org/software/grub/) with [Fedora and Flatcar patches](https://github.com/flatcar/scripts/tree/main/sdk_container/src/third_party/coreos-overlay/coreos/user-patches/sys-boot/grub). The Fedora patch is generated from the [rhboot/grub2](https://github.com/rhboot/grub2) repo. Together, these form version `2.12-flatcar3`. This is shown in user-visible parts of GRUB.
 
 *******************************************************************************
 ### If your shim launches any other components apart from your bootloader, please provide further details on what is launched.