Merge pull request #514 from creative-commoners/pulls/5/depr

DOC Deprecate passing non-array $field argument

en/08_Changelogs/5.3.0.md

@@ -69,6 +69,10 @@ This is particularly helpful if you need to update columns in one table to match
 - [`GridFieldDetailForm_ItemRequest`](api:SilverStripe\Forms\GridField\GridFieldDetailForm_ItemRequest) now uses a [`PjaxResponseNegotiator`](api:SilverStripe\Control\PjaxResponseNegotiator) to handle PJAX responses for the save and publish actions. This aligns it with responses from other form submissions in the CMS.
 - Primitive types inside an iterable object will now be automatically converted to relevant [`DBField`](api:SilverStripe\ORM\FieldType\DBField) types so can be rendered in a template. This allows the use of `return ArrayList::create(['lorem', 123]);` from a [`ContentController`](api:SilverStripe\CMS\Controllers\ContentController) method that is then looped over in a template.
 
+## API changes
+
+Passing a non-array `$fields` argument to both [`FieldList::addFieldsToTab()`](api:SilverStripe\Forms\FieldList::addFieldsToTab()) and [`FieldList::removeFieldsFromTab()`](api:SilverStripe\Forms\FieldList::removeFieldsFromTab()) has been deprecated.
+
 ## Bug fixes
 
 This release includes a number of bug fixes to improve a broad range of areas. Check the change logs for full details of these fixes split by module. Thank you to the community members that helped contribute these fixes as part of the release!