Update docs

Author: DouweM

doc/development/sidekiq_style_guide.md

@@ -3,6 +3,12 @@
 This document outlines various guidelines that should be followed when adding or
 modifying Sidekiq workers.
 
+## ApplicationWorker
+
+All workers should include `ApplicationWorker` instead of `Sidekiq::Worker`,
+which adds some convenience methods and automatically sets the queue based on
+the worker's name.
+
 ## Default Queue
 
 Use of the "default" queue is not allowed. Every worker should use a queue that
@@ -13,18 +19,10 @@ A list of all available queues can be found in `config/sidekiq_queues.yml`.
 
 ## Dedicated Queues
 
-Most workers should use their own queue. To ease this process a worker can
-include the `DedicatedSidekiqQueue` concern as follows:
-
-```ruby
-class ProcessSomethingWorker
-  include ApplicationWorker
-end
-```
-
-This will set the queue name based on the class' name, minus the `Worker`
-suffix. In the above example this would lead to the queue being
-`process_something`.
+Most workers should use their own queue, which is automatically set based on the
+worker class name. For a worker named `ProcessSomethingWorker`, the queue name
+would be `process_something`. If you're not sure what a worker's queue name is,
+you can find it using `SomeWorker.queue`.
 
 In some cases multiple workers do use the same queue. For example, the various
 workers for updating CI pipelines all use the `pipeline` queue. Adding workers
@@ -38,7 +36,7 @@ tests should be placed in `spec/workers`.
 
 ## Removing or renaming queues
 
-Try to avoid renaming or removing queues in minor and patch releases. 
-During online update instance can have pending jobs and removing the queue can 
-lead to those jobs being stuck forever. If you can't write migration for those 
-Sidekiq jobs, please consider doing rename or remove queue in major release only. 
+Try to avoid renaming or removing queues in minor and patch releases.
+During online update instance can have pending jobs and removing the queue can
+lead to those jobs being stuck forever. If you can't write migration for those
+Sidekiq jobs, please consider doing rename or remove queue in major release only.