Merge stable into master

docs/installation/getting-started/quick-start.md

@@ -98,7 +98,7 @@ The fastest way to run an advanced editor using the {@link features/index rich e
 
 In the superbuild, all editor classes are stored under the `CKEDITOR` object. Apart from that exception, the editor initialization is no different than the one described in the {@link installation/getting-started/predefined-builds#available-builds available builds documentation}.
 
-Because the superbuild contains a lot of plugins, you may need to remove the plugins you do not need with the <code>removePlugins</code> configuration option and adjust the toolbar configuration. There are also some plugins, like the {@link features/productivity-pack Productivity Pack}, that require a license to run. Observe the config below to see this implemented.
+Because the superbuild contains a lot of plugins, you may need to remove the plugins you do not need with the <code>removePlugins</code> configuration option and adjust the toolbar configuration. There are also some plugins, like the {@link features/productivity-pack Productivity Pack}, that require a license to run. You can learn more about obtaining and activating license keys in the {@link support/license-key-and-activation License key and activation} guide. Observe the config below to see this implemented.
 
 ### Sample implementation