boot: Fix reference to bootmenu doc

The Kconfig references a readme file that's moved and
converted to rst so update the reference.

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/boot/Kconfig b/boot/Kconfig
index e8fb03b..86c2787 100644 (file)
--- a/boot/Kconfig
+++ b/boot/Kconfig
@@ -1439,7 +1439,7 @@ config AUTOBOOT_MENU_SHOW
          This enables the boot menu, controlled by environment variables
          defined by the board. The menu starts after running the 'preboot'
          environmnent variable (if enabled) and before handling the boot delay.
-         See README.bootmenu for more details.
+         See doc/usage/cmd/bootmenu.rst for more details.
 
 config BOOTMENU_DISABLE_UBOOT_CONSOLE
        bool "Disallow bootmenu to enter the U-Boot console"