Fix typo in types

Author: wooorm

lib/index.js

@@ -79,7 +79,7 @@ export default function rehypeDocument(options) {
    *   Tree.
    * @param {VFile} file
    *   File.
-   * @param {Root} tree
+   * @returns {Root}
    *   New tree.
    */
   return function (tree, file) {
@@ -174,6 +174,6 @@ function toList(value) {
   return value === null || value === undefined
     ? []
     : Array.isArray(value)
-    ? value
-    : [value]
+      ? value
+      : [value]
 }