Update cheatsheets

tldr/linux/udiskie-umount

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# udiskie-umount
+
+> Manually unmount devices using udiskie.
+> See also: `udiskie`, `udiskie-mount`.
+> More information: <https://github.com/coldfix/udiskie/wiki/Usage>.
+
+- Unmount a mounted device:
+
+`udiskie-umount {{path/to/mount}}`
+
+- Unmount and power down a USB device:
+
+`udiskie-umount --detach {{path/to/mount}}`
+
+- Eject an optical drive:
+
+`udiskie-umount --eject {{path/to/mount}}`
+
+- Display help:
+
+`udiskie-umount --help`