docs: move "Access Token Lifetime" into "Configuration"

Author: kenjis

docs/references/authentication/tokens.md

@@ -83,18 +83,6 @@ $token = $user->getAccessTokenById($id);
 $tokens = $user->accessTokens();
 ```
 
-## Access Token Lifetime
-
-Tokens will expire after a specified amount of time has passed since they have been used.
-By default, this is set to 1 year. You can change this value by setting the `$unusedTokenLifetime`
-value in the **app/Config/AuthToken.php** config file. This is in seconds so that you can use the
-[time constants](https://codeigniter.com/user_guide/general/common_functions.html#time-constants)
-that CodeIgniter provides.
-
-```php
-public $unusedTokenLifetime = YEAR;
-```
-
 ## Access Token Scopes
 
 Each token can be given one or more scopes they can be used within. These can be thought of as
@@ -128,6 +116,18 @@ if ($user->tokenCant('forums.manage')) {
 
 ## Configuration
 
+### Access Token Lifetime
+
+Tokens will expire after a specified amount of time has passed since they have been used.
+By default, this is set to 1 year. You can change this value by setting the `$unusedTokenLifetime`
+value in the **app/Config/AuthToken.php** config file. This is in seconds so that you can use the
+[time constants](https://codeigniter.com/user_guide/general/common_functions.html#time-constants)
+that CodeIgniter provides.
+
+```php
+public $unusedTokenLifetime = YEAR;
+```
+
 ### Login Attempt Logging
 
 By default, only failed login attempts are recorded in the `auth_token_logins` table.