Update cheatsheets

tldr/linux/bore

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# bore
+
+> Start a local proxy to a remote server using Bore.
+> Some subcommands such as `local` have their own usage documentation.
+> More information: <https://github.com/ekzhang/bore#detailed-usage>.
+
+- Expose a local port to a remote Bore server:
+
+`bore local {{[-t|--to]}} {{remote_server_address}} {{local_port}}`
+
+- Start a Bore server:
+
+`bore server`
+
+- Display help:
+
+`bore {{[-h|--help]}}`