add document, fix tooltip position issue

lib/utility/lgres.d.ts

@@ -1,4 +1,9 @@
-export function init(dom?: HTMLElement, ahead?:  | { callback?: (result: any) => void }): Promise<any>
+interface LgresOptions {
+    template?: string,
+    callback?: (result: any) => void
+}
+
+export function init(dom?: HTMLElement, options?: LgresOptions): Promise<any>
 export function r(key: string, defaultValue?: any): any
 export const lang: {
     get current(): string,