Docs: Fixed invalid code sample. Closes ckeditor/ckeditor5#6351.

src/view/rooteditableelement.js

@@ -41,23 +41,22 @@ export default class RootEditableElement extends EditableElement {
 	/**
 	 * Checks whether this object is of the given.
 	 *
-	 *		rootEditableElement.is( 'rootEditableElement' ); // -> true
+	 *		rootEditableElement.is( 'rootElement' ); // -> true
 	 *		rootEditableElement.is( 'editableElement' ); // -> true
 	 *		rootEditableElement.is( 'element' ); // -> true
 	 *		rootEditableElement.is( 'node' ); // -> true
-	 *		rootEditableElement.is( 'view:rootEditableElement' ); // -> true
 	 *		rootEditableElement.is( 'view:editableElement' ); // -> true
 	 *		rootEditableElement.is( 'view:element' ); // -> true
 	 *		rootEditableElement.is( 'view:node' ); // -> true
 	 *
 	 *		rootEditableElement.is( 'model:element' ); // -> false
 	 *		rootEditableElement.is( 'documentFragment' ); // -> false
 	 *
-	 * Assuming that the object being checked is a root editbale element, you can also check its
+	 * Assuming that the object being checked is a root editable element, you can also check its
 	 * {@link module:engine/view/rooteditableelement~RootEditableElement#name name}:
 	 *
 	 *		rootEditableElement.is( 'div' ); // -> true if this is a div root editable element
-	 *		rootEditableElement.is( 'rootEditableElement', 'div' ); // -> same as above
+	 *		rootEditableElement.is( 'rootElement', 'div' ); // -> same as above
 	 *		text.is( 'div' ); -> false
 	 *
 	 * {@link module:engine/view/node~Node#is Check the entire list of view objects} which implement the `is()` method.