Link to API docs [ci-skip]

Author: jonathanhefner

guides/source/configuring.md

@@ -2810,12 +2810,16 @@ config.active_storage.logger = ActiveSupport::Logger.new(STDOUT)
 
 Determines the default expiry of URLs generated by:
 
-* `ActiveStorage::Blob#url`
-* `ActiveStorage::Blob#service_url_for_direct_upload`
-* `ActiveStorage::Variant#url`
+* [`ActiveStorage::Blob#url`][]
+* [`ActiveStorage::Blob#service_url_for_direct_upload`][]
+* [`ActiveStorage::Variant#url`][]
 
 The default is 5 minutes.
 
+[`ActiveStorage::Blob#url`]: https://api.rubyonrails.org/classes/ActiveStorage/Blob.html#method-i-url
+[`ActiveStorage::Blob#service_url_for_direct_upload`]: https://api.rubyonrails.org/classes/ActiveStorage/Blob.html#method-i-service_url_for_direct_upload
+[`ActiveStorage::Variant#url`]: https://api.rubyonrails.org/classes/ActiveStorage/Variant.html#method-i-url
+
 #### `config.active_storage.urls_expire_in`
 
 Determines the default expiry of URLs in the Rails application generated by Active Storage. The default is nil.