docs: correct the return type of Object#setACL

Author: leeyeh

src/object.js

@@ -1263,7 +1263,7 @@ module.exports = function(AV) {
      * @param {AV.ACL} acl An instance of AV.ACL.
      * @param {Object} options Optional Backbone-like options object to be
      *     passed in to set.
-     * @return {Boolean} Whether the set passed validation.
+     * @return {AV.Object} self
      * @see AV.Object#set
      */
     setACL: function(acl, options) {

storage.d.ts

@@ -280,36 +280,36 @@ export class Object extends BaseObject {
     static register(klass: Function, name?: string): void;
 
     initialize(): void;
-    add(attributeName: string, item: any): Object;
+    add(attributeName: string, item: any): this;
     addUnique(attributeName: string, item: any): any;
-    bitAnd(attributeName: string, item: number): Object;
-    bitOr(attributeName: string, item: number): Object;
-    bitXor(attributeName: string, item: number): Object;
+    bitAnd(attributeName: string, item: number): this;
+    bitOr(attributeName: string, item: number): this;
+    bitXor(attributeName: string, item: number): this;
     change(options: any): Object;
     changedAttributes(diff: any): boolean;
     clear(options: any): any;
     clone(): Object;
-    destroy<T>(options?: Object.DestroyOptions): Promise<T>;
+    destroy(options?: Object.DestroyOptions): Promise<this>;
     dirty(attr: String): boolean;
     escape(attr: string): string;
-    fetch<T>(fetchOptions?: FetchOptions, options?: AuthOptions): Promise<T>;
-    fetchWhenSave(enable: boolean): any;
+    fetch(fetchOptions?: FetchOptions, options?: AuthOptions): Promise<this>;
+    fetchWhenSave(enable: boolean): void;
     get(attr: string): any;
     getACL(): ACL;
     has(attr: string): boolean;
     hasChanged(attr: string): boolean;
-    increment(attr: string, amount?: number): any;
+    increment(attr: string, amount?: number): this;
     isValid(): boolean;
     op(attr: string): any;
     previous(attr: string): any;
     previousAttributes(): any;
     relation(attr: string): Relation;
-    remove(attr: string, item: any): any;
-    save<T>(attrs?: object | null, options?: Object.SaveOptions): Promise<T>;
-    save<T>(key: string, value: any, options?: Object.SaveOptions): Promise<T>;
-    set(key: string, value: any, options?: Object.SetOptions): boolean;
-    setACL(acl: ACL, options?: Object.SetOptions): boolean;
-    unset(attr: string, options?: Object.SetOptions): any;
+    remove(attr: string, item: any): this;
+    save(attrs?: object | null, options?: Object.SaveOptions): Promise<this>;
+    save(key: string, value: any, options?: Object.SaveOptions): Promise<this>;
+    set(key: string, value: any, options?: Object.SetOptions): this;
+    setACL(acl: ACL, options?: Object.SetOptions): this;
+    unset(attr: string, options?: Object.SetOptions): this;
     validate(attrs: any): any;
     toFullJSON(): any;
 }