Update cheatsheets

tldr/linux/lxc-console

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# lxc-console
+
+> Attach to a container.
+> More information: <https://linuxcontainers.org/lxc/manpages//man1/lxc-console.1.html>.
+
+- Start a console in a container:
+
+`agetty {{[-L|--local-line]}} {{38400}} tty1`
+
+- Connect to an lxc console:
+
+`sudo lxc-console {{container_name}}`
+
+- Exit `lxc-console`:
+
+`<Ctrl a><q>`