Update guide docs for the evented file watcher

Having it be an extra point at the bottom looks out of place. Additionally, it implies that the
watcher will be used simply by adding the listen gem to the gemfile which is not true.

Author: Earlopain

guides/source/configuring.md

@@ -399,7 +399,21 @@ end
 
 #### `config.file_watcher`
 
-Is the class used to detect file updates in the file system when `config.reload_classes_only_on_change` is `true`. Rails ships with `ActiveSupport::FileUpdateChecker`, the default, and `ActiveSupport::EventedFileUpdateChecker` (this one depends on the [listen](https://github.com/guard/listen) gem). Custom classes must conform to the `ActiveSupport::FileUpdateChecker` API.
+Is the class used to detect file updates in the file system when `config.reload_classes_only_on_change` is `true`. Rails ships with `ActiveSupport::FileUpdateChecker`, the default, and `ActiveSupport::EventedFileUpdateChecker`. Custom classes must conform to the `ActiveSupport::FileUpdateChecker` API.
+
+Using `ActiveSupport::EventedFileUpdateChecker` depends on the [listen](https://github.com/guard/listen) gem:
+
+```ruby
+group :development do
+  gem "listen", "~> 3.5"
+end
+```
+
+On Linux and macOS no additional gems are needed, but some are required
+[for *BSD](https://github.com/guard/listen#on-bsd) and
+[for Windows](https://github.com/guard/listen#on-windows).
+
+Note that [some setups are unsupported](https://github.com/guard/listen#issues--limitations).
 
 #### `config.filter_parameters`
 
@@ -4034,24 +4048,3 @@ Disallow: /
 
 To block just specific pages, it's necessary to use a more complex syntax. Learn
 it on the [official documentation](https://www.robotstxt.org/robotstxt.html).
-
-Evented File System Monitor
----------------------------
-
-If the [listen gem](https://github.com/guard/listen) is loaded Rails uses an
-evented file system monitor to detect changes when reloading is enabled:
-
-```ruby
-group :development do
-  gem "listen", "~> 3.5"
-end
-```
-
-Otherwise, in every request Rails walks the application tree to check if
-anything has changed.
-
-On Linux and macOS no additional gems are needed, but some are required
-[for *BSD](https://github.com/guard/listen#on-bsd) and
-[for Windows](https://github.com/guard/listen#on-windows).
-
-Note that [some setups are unsupported](https://github.com/guard/listen#issues--limitations).