Docs for https://github.com/silverstripe/silverstripe-versioned/pull/35/

docs/en/02_Developer_Guides/00_Model/10_Versioning.md

@@ -57,6 +57,49 @@ Versioning only works if you are adding the extension to the base class. That is
 of `DataObject`. Adding this extension to children of the base class will have unpredictable behaviour.
 </div>
 
+## Versioned gridfield extension
+
+By default the versioned module includes a `VersionedGridfieldDetailForm` that can extend gridfield
+with versioning support for models.
+
+You can enable this on a per-model basis using the following code:
+
+```php
+use SilverStripe\ORM\DataObject;
+use SilverStripe\Versioned\Versioned;
+class MyBanner extends DataObject {
+    private static $extensions = [
+        Versioned::class,
+    ];
+    private static $versioned_gridfield_extensions = true;
+}
+```
+
+This can be manually enabled for a single gridfield, alternatively, by setting the following option on the
+GridFieldDetailForm component.
+
+```php
+use SilverStripe\CMS\Model\SiteTree;
+use SilverStripe\Forms\GridField\GridField;
+use SilverStripe\Forms\GridField\GridFieldConfig_RelationEditor;
+use SilverStripe\Forms\GridField\GridFieldDetailForm;
+use SilverStripe\Versioned\VersionedGridFieldItemRequest;
+class Page extends SiteTree
+{
+    public function getCMSFields()
+    {
+        $fields = parent::getCMSFields();
+        $config = GridFieldConfig_RelationEditor::create();
+        $config
+            ->getComponentByType(GridFieldDetailForm::class)
+            ->setItemRequestClass(VersionedGridFieldItemRequest::class);
+        $gridField = GridField::create('Items', 'Items', $this->Items(), $config);
+        $fields->addFieldToTab('Root.Items', $gridField);
+        return $fields;
+    }
+}
+```
+
 ## Database Structure
 
 Depending on whether staging is enabled, one or more new tables will be created for your records. `<class>_versions`
@@ -217,7 +260,6 @@ without requiring any custom code.
         'Image'
     ];
 }
-
 ```
 
 Note that ownership cannot be used with polymorphic relations. E.g. has_one to non-type specific `DataObject`. 
@@ -265,7 +307,6 @@ E.g.
         return MyParent::get()->first();
     }
 }
-
 ```
 
 #### DataObject Ownership in HTML Content
@@ -333,7 +374,6 @@ E.g.
         return Permission::checkMember($member, 'ADMIN');
     }
 }
-
 ```
 
 If you want to control permissions of an object in an extension, you can also use
@@ -376,7 +416,6 @@ E.g.
     ];
     private static $non_live_permissions = ['ADMIN'];
 }
-
 ```
 
 Versioned applies no additional permissions to `canEdit` or `canCreate`, and such