fixed 0fca26a0 from https://gitee.com/huyisuo/docs/pulls/22559

Modify the onBackPress return value
Signed-off-by: Nhwx1119949 <huyisuo@huawei.com>
Change-Id: I2db77adee200ab4c02995c889ccf86e74c123553

zh-cn/application-dev/reference/arkui-ts/ts-custom-component-lifecycle.md

@@ -40,7 +40,7 @@ onPageHide?(): void
 
 ## onBackPress
 
-onBackPress?(): void
+onBackPress?(): void | boolean
 
 当用户点击返回按钮时触发，仅\@Entry装饰的自定义组件生效。