Fix first parameter's type of JSON.parse, and fix jsdoc.

lib/lib.es5.d.ts

@@ -1052,11 +1052,11 @@ declare var URIError: URIErrorConstructor;
 interface JSON {
     /**
      * Converts a JavaScript Object Notation (JSON) string into an object.
-     * @param text A valid JSON string.
+     * @param text A valid JSON string, or can be converted to a valid JSON string.
      * @param reviver A function that transforms the results. This function is called for each member of the object.
      * If a member contains nested objects, the nested objects are transformed before the parent object is.
      */
-    parse(text: string, reviver?: (this: any, key: string, value: any) => any): any;
+    parse(text: any, reviver?: (this: any, key: string, value: any) => any): any;
     /**
      * Converts a JavaScript value to a JavaScript Object Notation (JSON) string.
      * @param value A JavaScript value, usually an object or array, to be converted.