update zh-cn/application-dev/reference/arkui-ts/ts-components-canvas-canvasgradient.md.

Signed-off-by: Nqiqimao <qiqimao1234@163.com>
Signed-off-by: Nqiqimao <qiqimao1234@163.com>

zh-cn/application-dev/reference/arkui-ts/ts-components-canvas-canvasgradient.md

@@ -45,8 +45,9 @@ addColorStop(offset: number, color: string): void
       }
       .width('100%')
       .height('100%')
-    }
-  }
-  ```
+    }}
 
-  ![zh-cn_image_0000001194032516](figures/zh-cn_image_0000001194032516.png)
+
+![zh-cn_image_0000001194032516](figures/zh-cn_image_0000001194032516.png)
+
+ 
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