fix(handsontable): 修改rowHeaders参数声明

handsontable/handsontable.d.ts

@@ -2118,7 +2118,7 @@ declare namespace Handsontable {
     readOnlyCellClassName?: string;
     renderAllRows?: boolean;
     renderer?: string | renderers.Base;
-    rowHeaders?: boolean | any[] | (() => void);
+    rowHeaders?: boolean | any[] | ((index: number) => string | number);
     rowHeaderWidth?: number | any[];
     rowHeights?: any[] | (() => void) | number | string;
     search?: boolean;