Update cheatsheets

tldr/linux/steamos-chroot

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# steamos-chroot
+
+> Switch root directory in a SteamOS environment.
+> More information: <https://gitlab.com/users/evlaV/projects>.
+
+- Switch to the other A/B partition:
+
+`steamos-chroot --partset other`
+
+- Switch to a partition on another drive:
+
+`steamos-chroot --disk {{/dev/sdX}} --partset {{A|B}}`
+
+- Display help:
+
+`steamos-chroot --help`