Replace deprecated methods update_attributes and update_attributes!

doc/administration/maintenance_mode/index.md

@@ -35,8 +35,8 @@ There are three ways to enable Maintenance Mode as an administrator:
 - [**Rails console**](../operations/rails_console.md#starting-a-rails-console-session):
 
   ```ruby
-  ::Gitlab::CurrentSettings.update_attributes!(maintenance_mode: true)
-  ::Gitlab::CurrentSettings.update_attributes!(maintenance_mode_message: "New message")
+  ::Gitlab::CurrentSettings.update!(maintenance_mode: true)
+  ::Gitlab::CurrentSettings.update!(maintenance_mode_message: "New message")
   ```
 
 ## Disable Maintenance Mode

doc/administration/troubleshooting/gitlab_rails_cheat_sheet.md

@@ -1193,11 +1193,11 @@ Among other attributes, in the output you will notice that all the settings avai
 You can then set anyone of Elasticsearch integration settings by issuing a command similar to:
 
 ```ruby
-ApplicationSetting.last.update_attributes(elasticsearch_url: '<your ES URL and port>')
+ApplicationSetting.last.update(elasticsearch_url: '<your ES URL and port>')
 
 #or
 
-ApplicationSetting.last.update_attributes(elasticsearch_indexing: false)
+ApplicationSetting.last.update(elasticsearch_indexing: false)
 ```
 
 #### Getting attributes

doc/user/admin_area/settings/sign_in_restrictions.md

@@ -76,7 +76,7 @@ If necessary, you can disable **Admin Mode** as an administrator by using one of
 - [**Rails console**](../../../administration/operations/rails_console.md#starting-a-rails-console-session):
 
   ```ruby
-  ::Gitlab::CurrentSettings.update_attributes!(admin_mode: false)
+  ::Gitlab::CurrentSettings.update!(admin_mode: false)
   ```
   
 ## Two-factor authentication