emergencyMode, emergencyAccess: cross reference options in docs.

I was confused why I could not get an emergency access console despite setting systemd.emergencyMode=true.

Turns out there is another similar option `boot.initrd.systemd.emergencyAccess` that I should have used.

This is confusing and this change should make it more clear vie the docs of both these options.

nixos/modules/system/boot/emergency-mode.nix

@@ -1,4 +1,9 @@
-{ config, lib, ... }:
+{
+  config,
+  lib,
+  options,
+  ...
+}:
 {
 
   ###### interface
@@ -15,6 +20,8 @@
         instances) have no console of any kind, emergency mode doesn't
         make sense, and it's better to continue with the boot insofar
         as possible.
+
+        For initrd emergency access, use ${options.boot.initrd.systemd.emergencyAccess} instead.
       '';
     };
 

nixos/modules/system/boot/systemd/initrd.nix

@@ -266,6 +266,8 @@ in
 
         Can also be set to a hashed super user password to allow
         authenticated access to the emergency mode.
+
+        For emergency access after initrd, use `${options.systemd.enableEmergencyMode}` instead.
       '';
       default = false;
     };