vboot: update comment

The comment in the source referred to an earlier approach, so update
it to match current reality.

Change-Id: I9a23ec0a719fb623cfd465c397ef7ef16550b93c
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36862
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Joel Kitching <kitching@google.com>

src/security/vboot/misc.h

@@ -32,7 +32,7 @@ struct selected_region {
  * Stores vboot-related information.  selected_region is used by verstage to
  * store the location of the selected slot.  buffer is used by vboot to store
  * its work buffer.  vb2_context is contained within this work buffer, and is
- * accessible via vboot_init_context() and vboot_get_context() (see below).
+ * accessible via vboot_get_context() declared below.
  * Keep the struct CPU architecture agnostic as it crosses stage boundaries.
  */
 struct vboot_working_data {