DOC Document removing empty actions header from gridfield (#830)

Author: GuySartorelli

en/08_Changelogs/6.2.0.md

@@ -86,6 +86,7 @@ If you have implemented a custom requirements backend, we recommend updating it
 - The built-in session handlers [`FileSessionHandler`](api:SilverStripe\Control\SessionHandler\FileSessionHandler), [`CacheSessionHandler`](api:SilverStripe\Control\SessionHandler\CacheSessionHandler), and [`DatabaseSessionHandler`](api:SilverStripe\Control\SessionHandler\DatabaseSessionHandler) all now validate the session ID `PHPSESSID` to ensure it matches a valid format, otherwise a `RuntimeException` will be thrown.
 - [`Hierarchy::duplicateWithChildren()`](api:SilverStripe\ORM\Hierarchy\Hierarchy::duplicateWithChildren()) used to set new sort values for duplicated children - it now uses the sort values from the original records.
 - Fields returned from [`QueuedJobDescriptor::getCMSFields()`](api:Symbiote\QueuedJobs\DataObjects\QueuedJobDescriptor::getCMSFields()) have changed to improve the UX. If you were changing those fields (e.g. with a subclass or an extension implementing `updateCMSFields()`) you may need to adjust your code to account for these changes.
+- In a [`GridField`](api:SilverStripe\Forms\GridField\GridField), if there are no actions in the [`GridField_ActionMenu`](api:SilverStripe\Forms\GridField\GridField_ActionMenu) component, the empty actions column (the column with the `col-Actions` CSS class) will be ommitted.
 - The text for various buttons in the CMS have changed from "Add {record}" to "Add new {record}". The text uses new localisation keys:
 
     |Old key|New key|