doc: Update to the new 'grub-theme' procedure.
This is a follow-up commit to 9cdb10d52e:
gnu: grub: Allow a PNG image and replace "aspect-ratio" with "resolution".
* doc/guix.texi (Bootloader Configuration): Describe and use the 'grub-theme'
procedure instead of the removed '%default-theme' variable.
			
			
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		|  | @ -26983,14 +26983,14 @@ The GRUB @code{gfxmode} to set (a list of screen resolution strings, see | |||
| @end table | ||||
| @end deftp | ||||
| 
 | ||||
| @defvr {Scheme Variable} %default-theme | ||||
| This is the default GRUB theme used by the operating system if no | ||||
| @deffn {Scheme Procedure} grub-theme | ||||
| Return the default GRUB theme used by the operating system if no | ||||
| @code{theme} field is specified in @code{bootloader-configuration} | ||||
| record. | ||||
| 
 | ||||
| It comes with a fancy background image displaying the GNU and Guix | ||||
| logos. | ||||
| @end defvr | ||||
| @end deffn | ||||
| 
 | ||||
| For example, to override the default resolution, you may use something | ||||
| like | ||||
|  | @ -27000,7 +27000,7 @@ like | |||
|  (bootloader-configuration | ||||
|  ;; @dots{} | ||||
|  (theme (grub-theme | ||||
|          (inherit %default-theme) | ||||
|          (inherit (grub-theme)) | ||||
|          (gfxmode '("1024x786x32" "auto")))))) | ||||
| @end lisp | ||||
| 
 | ||||
|  |  | |||
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