Update connection docs with information on how to connect to a MySQL server over a socket.

Author: tangix

user_guide_src/source/database/configuration.rst

@@ -66,6 +66,16 @@ add the config variables as a query string:
     database character set), which are present in the rest of the configuration
     fields, CodeIgniter will append them.
 
+Configuring a MySQL socket connection
+-------------------------------------
+
+To connect to a MySQL server over a filesystem socket, the path to the socket should be specified in 
+the ``'hostname'`` setting. CodeIgniter's MySQLi driver will notice this and configure the 
+connection properly.
+
+.. literalinclude:: configuration/011.php
+    :lines: 11-18
+
 Failovers
 ---------
 

user_guide_src/source/database/configuration/011.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Config;
+
+use CodeIgniter\Database\Config;
+
+class Database extends Config
+{
+    // ...
+
+    // MySQLi over a socket
+    public array $default = [
+        // ...
+        'hostname' => '/cloudsql/toolbox-tests:europe-north1:toolbox-db"',
+        // ...
+        'DBDriver' => 'MySQLi',
+        // ...
+    ];
+
+    // ...
+}