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jmap: add Chinese translation (#6403)

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# jmap
> Java 内存映射工具。
> 更多信息:<https://docs.oracle.com/javase/7/docs/technotes/tools/share/jmap.html>.
- 打印 Java 进程的共享对象映射(类似 pmap 的输出):
`jmap {{Java 进程号}}`
- 打印堆摘要信息:
`jmap -heap {{Java 进程号}}`
- 按类型打印堆使用的直方图:
`jmap -histo {{Java 进程号}}`
- 将堆的内容转储到二进制文件中以使用 jhat 进行分析:
`jmap -dump:format=b,file={{导出文件名}} {{Java 进程号}}`