lockdown: Replace the other reference to a nonexistent manual page

debian/patches/features/all/lockdown/lockdown-refer-to-debian-wiki-until-manual-page-exists.patch

@@ -21,3 +21,12 @@ Debian wiki.
  			  where);
  	}
  }
+@@ -60,7 +60,7 @@ void __init init_lockdown(void)
+ bool __kernel_is_locked_down(const char *what, bool first)
+ {
+ 	if (what && first && kernel_locked_down)
+-		pr_notice("Lockdown: %s is restricted; see man kernel_lockdown.7\n",
++		pr_notice("Lockdown: %s is restricted; see https://wiki.debian.org/SecureBoot\n",
+ 			  what);
+ 	return kernel_locked_down;
+ }