Pull request #1632: 无jira任务，补充single中setTitle方法的描述

Merge in VISUAL/fineui from ~GUYI/fineui:master to master

* commit '8d18ba54e2526ca75c1c6574f064d050bfe8a982':
  无jira任务，补充single中setTitle方法的描述

typescript/base/single/single.ts

@@ -11,7 +11,7 @@ export interface _Single extends _Widget {
 
     disabledHover(): void;
 
-    setTitle(title: string, opt?: SingleOpt): void;
+    setTitle(title: string | Function, opt?: SingleOpt): void;
 
     setWarningTitle(title: string, opt?: SingleOpt): void;