Update cheatsheets

tldr/linux/steamosctl

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# steamosctl
+
+> Control the SteamOS system.
+> More information: <https://gitlab.com/evlaV/steamos-manager>.
+
+- Change to desktop mode:
+
+`steamosctl switch-to-desktop-mode`
+
+- Change to gamemode:
+
+`steamosctl switch-to-game-mode`
+
+- Change whether the system opens gamemode or desktop during login:
+
+`steamosctl set-default-login-mode {{game|desktop}}`
+
+- Display help:
+
+`steamosctl`