update zh-cn/application-dev/reference/apis/js-apis-matrix4.md.

Signed-off-by: LiAn <lian15@huawei.com> 
Signed-off-by: NLiAn <lian15@huawei.com>

zh-cn/application-dev/reference/apis/js-apis-matrix4.md

@@ -148,7 +148,7 @@ import matrix4 from '@ohos.matrix4'
 @Entry
 @Component
 struct Test {
-  private matrix1 = Matrix4.identity().translate({x:100})
+  private matrix1 = matrix4.identity().translate({x:100})
   private matrix2 = this.matrix1.copy().scale({x:2})
 
   build() {