Merge pull request #14686 from ckeditor/ck/14675-migration-guide-for-…

…changed-placeholder-text-API

Docs: migration guide for changed placeholder API. Closes #14675.

docs/updating/update-to-39.md

@@ -81,3 +81,18 @@ ClassicEditor
 		}
 	} )
 ```
+
+### View element placeholder
+
+Function {@link module:engine/view/placeholder~enablePlaceholder `enablePlaceholder()`} no longer gets placeholder content as a `text` property of `options` argument. To define a value of placeholder you need to specify it as a {@link module:engine/view/placeholder~PlaceholderableElement#placeholder `placeholder` property} of the `element` which is passed into `options` object.
+
+```js
+element.placeholder = 'Type something…';
+
+enablePlaceholder( {
+    view: editingView,
+    element: element,
+    isDirectHost: false,
+    keepOnFocus: true
+} );
+```