Minor improvements to Puma docs

doc/administration/operations/puma.md

@@ -10,7 +10,8 @@ Unicorn unless explicitly specified not to.
 ## Why switch to Puma?
 
 Puma has a multi-thread architecture which uses less memory than a multi-process
-application server like Unicorn.
+application server like Unicorn. On GitLab.com, we saw a 40% reduction in memory
+consumption.
 
 Most Rails applications requests normally include a proportion of I/O wait time.
 During I/O wait time MRI Ruby will release the GVL (Global VM Lock) to other threads.
@@ -18,9 +19,14 @@ Multi-threaded Puma can therefore still serve more requests than a single proces
 
 ## Configuring Puma to replace Unicorn
 
-If you are currently running Unicorn and would like to switch to Puma, server configuration
-will _not_ carry over automatically. For details on matching Unicorn configuration settings with
-the Puma equivalent, where applicable, see [Converting Unicorn settings to Puma](https://docs.gitlab.com/omnibus/settings/puma.html#converting-unicorn-settings-to-puma).
+Beginning with GitLab 13.0, Puma is the default application server. We plan to remove support for
+Unicorn in GitLab 14.0.
+
+When switching to Puma, Unicorn server configuration
+will _not_ carry over automatically, due to differences between the two application servers.
+
+For Omnibus-based deployments, see [Configuring Puma Settings](https://docs.gitlab.com/omnibus/settings/puma.html#configuring-puma-settings). For Helm
+based deployments, see the [Webservice Chart documentation](https://docs.gitlab.com/charts/charts/gitlab/webservice/index.html).
 
 ## Performance caveat when using Puma with Rugged
 

doc/install/requirements.md

@@ -204,7 +204,7 @@ Omnibus GitLab defaults to the recommended Puma settings. Regardless of installa
 tune the Puma settings.
 
 If you're using Omnibus GitLab, see [Puma settings](https://docs.gitlab.com/omnibus/settings/puma.html)
-for instructions on changing the Puma settings.
+for instructions on changing the Puma settings. If you are using the GitLab Helm chart, see the [Webservice chart](https://docs.gitlab.com/charts/charts/gitlab/webservice/index.html).
 
 ### Puma workers