【OpenHarmony开源贡献者计划2022】update zh-cn/application-dev/reference/apis/js-apis-image.md.

中英文符号错误；
Signed-off-by: N方春兰 <clfanga@isoftstone.com>
Signed-off-by: N方春兰 <clfanga@isoftstone.com>

zh-cn/application-dev/reference/apis/js-apis-image.md

@@ -1449,7 +1449,7 @@ createPixelMap(callback: AsyncCallback\<PixelMap>): void
 
 ```js
 imageSourceApi.createPixelMap((err, pixelmap) => {
-                    console.info('Succeeded in creating pixelmap object.')；
+                    console.info('Succeeded in creating pixelmap object.');
                 })
 ```