update faq.md

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hengyunabc 2021-01-07 23:47:40 +08:00
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[https://github.com/alibaba/arthas/issues/44](https://github.com/alibaba/arthas/issues/44)
##### Can commands such as trace/watch enhance the classes in jdk?
##### trace/watch等命令能否增强jdk里的类
By default, classes beginning with `java.` are filtered out, but they can be turned on:
默认情况下会过滤掉`java.`开头的类,但可以通过参数开启。
```bash
options unsafe true