docs: add empty lines in sample code

Author: kenjis

user_guide_src/source/libraries/sessions/039.php

@@ -9,7 +9,9 @@ class Session extends BaseConfig
 {
     // ...
     public string $driver = 'CodeIgniter\Session\Handlers\DatabaseHandler';
+
     // ...
     public string $savePath = 'ci_sessions';
+
     // ...
 }

user_guide_src/source/libraries/sessions/041.php

@@ -9,7 +9,9 @@ class Session extends BaseConfig
 {
     // ...
     public string $driver = 'CodeIgniter\Session\Handlers\RedisHandler';
+
     // ...
     public string $savePath = 'tcp://localhost:6379';
+
     // ...
 }

user_guide_src/source/libraries/sessions/042.php

@@ -9,7 +9,9 @@ class Session extends BaseConfig
 {
     // ...
     public string $driver = 'CodeIgniter\Session\Handlers\MemcachedHandler';
+
     // ...
     public string $savePath = 'localhost:11211';
+
     // ...
 }