Update documentation for uefi x64 grub boot modes

AUTHORS.rst

@@ -34,3 +34,4 @@ Archiso Authors
 * Yu Li-Yu <afg984@gmail.com>
 * nl6720 <nl6720@gmail.com>
 * Øyvind Heggstad <heggstad@gmail.com>
+* plain linen <bcdedit@hotmail.com>

CHANGELOG.rst

@@ -9,6 +9,7 @@ Added
 -----
 
 - Configure the locale for the baseline profile to ``C.UTF-8`` so that a UTF-8 locale is used.
+- Add ``uefi-x64.grub.esp`` and ``uefi-x64.grub.eltorito`` boot mode to support x86_64 UEFI boot on x86_64 machines.
 
 Changed
 -------

docs/README.profile.rst

@@ -48,6 +48,8 @@ The image file is constructed from some of the variables in ``profiledef.sh``: `
   - ``bios.syslinux.eltorito``: Syslinux for x86 BIOS booting from an optical disc
   - ``uefi-ia32.grub.esp``: GRUB for IA32 UEFI booting from a disk
   - ``uefi-ia32.grub.eltorito``: GRUB for IA32 UEFI booting from an optical disc
+  - ``uefi-x64.grub.esp``: GRUB for x86_64 UEFI booting from a disk
+  - ``uefi-x64.grub.eltorito``: GRUB for x86_64 UEFI booting from an optical disc
   - ``uefi-x64.systemd-boot.esp``: systemd-boot for x86_64 UEFI booting from a disk
   - ``uefi-x64.systemd-boot.eltorito``: systemd-boot for x86_64 UEFI booting from an optical disc
     Note that BIOS El Torito boot mode must always be listed before UEFI El Torito boot mode.
@@ -168,7 +170,12 @@ The *custom template identifiers* are understood in all `.cfg` files in this dir
 grub
 ----
 
-This directory is mandatory when the ``uefi-ia32.grub.esp`` or ``uefi-ia32.grub.eltorito`` bootmodes are selected in
-``profiledef.sh``.
+This directory is mandatory when any of the following bootmodes is used in ``profiledef.sh``:
+
+- ``uefi-ia32.grub.esp`` or
+- ``uefi-ia32.grub.eltorito`` or
+- ``uefi-x64.grub.esp`` or
+- ``uefi-x64.grub.eltorito``
+
 It contains configuration files for `GRUB <https://www.gnu.org/software/grub/>`_
 used in the resulting image.