doc: uefi: Fix reference to CONFIG_EFI_SECURE_BOOT

There is no CONFIG_UEFI_SECURE_BOOT, and there was never any.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/doc/develop/uefi/uefi.rst b/doc/develop/uefi/uefi.rst
index b7bf135..fe337c8 100644
--- a/doc/develop/uefi/uefi.rst
+++ b/doc/develop/uefi/uefi.rst
@@ -105,7 +105,7 @@
 by verifying a signature (or message digest) of image with certificates.
 This feature on U-Boot is enabled with::
 
-    CONFIG_UEFI_SECURE_BOOT=y
+    CONFIG_EFI_SECURE_BOOT=y
 
 To make the boot sequence safe, you need to establish a chain of trust;
 In UEFI secure boot the chain trust is defined by the following UEFI variables