Update cheatsheets

tldr/linux/steamos-session-select

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# steamos-session-select
+
+> Manipulate which session is currently in use.
+> More information: <https://gitlab.com/users/evlaV/projects>.
+
+- Change to desktop mode:
+
+`steamos-session-select plasma`
+
+- Change to gamemode:
+
+`steamos-session-select gamescope`
+
+- Change to Wayland desktop mode:
+
+`steamos-session-select plasma-wayland-persistent`
+
+- Change to X11 desktop mode:
+
+`steamos-session-select plasma-x11-persistent`