migration to update text, fixes #3130

Closes #3130

Merge request studip/studip!2133

db/migrations/5.3.20_update_accessibility_receiver_info.php

+<?php
+
+class UpdateAccessibilityReceiverInfo extends Migration
+{
+    public function description()
+    {
+        return 'Update info text for ACCESSIBILITY_RECEIVER_EMAIL to clarify how to use it.';
+    }
+
+    protected function up()
+    {
+        $db = DBManager::get();
+
+        $db->exec(
+            "UPDATE `config`
+                SET `description` = 'Die E-Mail-Adressen der Personen, die beim Melden einer Barriere benachrichtigt werden sollen.
+                Beispiel: [\"mailadresse1@server.de\",\"mailadresse2@server.de\"]'
+                WHERE `field` = 'ACCESSIBILITY_RECEIVER_EMAIL'
+            "
+        );
+    }
+
+    protected function down()
+    {
+        $db = DBManager::get();
+        $db->exec(
+            "UPDATE `config`
+                SET `description` = 'Die E-Mail-Adressen der Personen, die beim Melden einer Barriere benachrichtigt werden sollen.'
+                WHERE `field` = 'ACCESSIBILITY_RECEIVER_EMAIL'
+            "
+        );
+    }
+}