update zh-cn/application-dev/media/image-decoding.md.

Signed-off-by: N renhw001 <renhongwei9@huawei.com>

update zh-cn/application-dev/media/image-decoding.md.
Signed-off-by: N renhw001 <renhongwei9@huawei.com>
5878818e · renhw001 · Gitee · 96a5968e · 5878818e
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zh-cn/application-dev/media/image-decoding.md zh-cn/application-dev/media/image-decoding.md +5 -0

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--- a/zh-cn/application-dev/media/image-decoding.md
+++ b/zh-cn/application-dev/media/image-decoding.md
@@ -144,3 +144,8 @@
   ```ts
   const pixelMap = await imageSource.createPixelMap();
   ```
+
+5. 释放pixelMap。
+   ```ts
+   pixelMap.release();
+   ```