Run multiple Sidekiq processes doc fixes

doc/administration/operations/extra_sidekiq_processes.md

@@ -38,7 +38,7 @@ To start multiple processes:
    process, and values in each item determine the queues it works on.
 
    For example, the following setting creates three Sidekiq processes, one to run on
-   `elastic_indexer`, one to run on `mailers`, and one process running all on queues:
+   `elastic_indexer`, one to run on `mailers`, and one process running on all queues:
 
    ```ruby
    sidekiq['queue_groups'] = [
@@ -327,9 +327,9 @@ Running Sidekiq cluster is the default in GitLab 13.0 and later.
    ```
 
 `min_concurrency` and `max_concurrency` are independent; one can be set without
-the other. Setting `min_concurrency` to 0 will disable the limit.
+the other. Setting `min_concurrency` to `0` will disable the limit.
 
-For each queue group, let N be one more than the number of queues. The
+For each queue group, let `N` be one more than the number of queues. The
 concurrency factor will be set to:
 
 1. `N`, if it's between `min_concurrency` and `max_concurrency`.