Update `current_user` override mode description in controllers (#30515)

app/controllers/api/v1/instances/extended_descriptions_controller.rb

@@ -5,7 +5,7 @@ class Api::V1::Instances::ExtendedDescriptionsController < Api::V1::Instances::B
 
   before_action :set_extended_description
 
-  # Override `current_user` to avoid reading session cookies unless in whitelist mode
+  # Override `current_user` to avoid reading session cookies unless in limited federation mode
   def current_user
     super if limited_federation_mode?
   end

app/controllers/api/v1/instances/peers_controller.rb

@@ -5,7 +5,7 @@ class Api::V1::Instances::PeersController < Api::V1::Instances::BaseController
 
   skip_around_action :set_locale
 
-  # Override `current_user` to avoid reading session cookies unless in whitelist mode
+  # Override `current_user` to avoid reading session cookies unless in limited federation mode
   def current_user
     super if limited_federation_mode?
   end

app/controllers/api/v1/instances/rules_controller.rb

@@ -5,7 +5,7 @@ class Api::V1::Instances::RulesController < Api::V1::Instances::BaseController
 
   before_action :set_rules
 
-  # Override `current_user` to avoid reading session cookies unless in whitelist mode
+  # Override `current_user` to avoid reading session cookies unless in limited federation mode
   def current_user
     super if limited_federation_mode?
   end

app/controllers/api/v1/instances_controller.rb

@@ -6,7 +6,7 @@ class Api::V1::InstancesController < Api::BaseController
 
   vary_by ''
 
-  # Override `current_user` to avoid reading session cookies unless in whitelist mode
+  # Override `current_user` to avoid reading session cookies unless in limited federation mode
   def current_user
     super if limited_federation_mode?
   end