Update cheatsheets

tldr/arthas

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# arthas
+
+> Java diagnostic tool.
+> See also: `arthas-watch`, `arthas-trace`.
+> More information: <https://arthas.aliyun.com/en/>.
+
+- Start Arthas:
+
+`java -jar {{path/to/arthas-boot.jar}}`
+
+- Reconnect Arthas (default port used by Arthas is 3658):
+
+`telnet localhost {{port_number}}`
+
+- Exit the current Arthas client without affecting other clients. equals `exit`、`logout`、`q` command:
+
+`exit|quit|logout|q`
+
+- Terminate the Arthas server, all the Arthas clients connecting to this server will be disconnected:
+
+`stop`