DOC Add note about updated text and localisation key (#817)

Author: GuySartorelli

en/08_Changelogs/6.2.0.md

@@ -52,6 +52,20 @@ If your own code uses a `font-icon-*` CSS class, we recommend adding `aria-hidde
 
 - [`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.
+- 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|
+    |---|---|
+    |`SilverStripe\Forms\GridField\GridField.Add`|`SilverStripe\Forms\GridField\GridField.AddNew`|
+    |`AssetAdmin.ADD_FOLDER_BUTTON`|`AssetAdmin.ADD_NEW_FOLDER_BUTTON`|
+    |`CampaignAdmin.ADDCAMPAIGN`|`CampaignAdmin.ADDNEWCAMPAIGN`|
+    |`SilverStripe\UserForms.ADDEMAILRECIPIENT`|`SilverStripe\UserForms.ADDNEWEMAILRECIPIENT`|
+    |`SilverStripe\UserForms\Extension\UserFormFieldEditorExtension.ADD_FIELD`|`SilverStripe\UserForms\Extension\UserFormFieldEditorExtension.ADD_NEW_FIELD`|
+    |`SilverStripe\UserForms\Extension\UserFormFieldEditorExtension.ADD_FIELD_GROUP`|`SilverStripe\UserForms\Extension\UserFormFieldEditorExtension.ADD_NEW_FIELD_GROUP`|
+    |`SilverStripe\UserForms\Extension\UserFormFieldEditorExtension.ADD_PAGE_BREAK`|`SilverStripe\UserForms\Extension\UserFormFieldEditorExtension.ADD_NEW_PAGE_BREAK`|
+    |`SilverStripe\UserForms\Model\UserDefinedForm.ADDEMAILRECIPIENT`|`SilverStripe\UserForms\Model\UserDefinedForm.ADDNEWEMAILRECIPIENT`|
+    |`ElementAddNewButton.ADD_BLOCK`|`ElementAddNewButton.ADD_NEW_BLOCK`|
+    |`LinkField.ADD_LINK`|`LinkField.ADD_NEW_LINK`|
 
 ## API changes