Update cheatsheets

osx/diskutil

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+---
+syntax: markdown
+tags: [tldr, osx]
+source: https://github.com/tldr-pages/tldr.git
+---
+# diskutil
+
+> Utility to manage local disks and volumes.
+> More information: <https://keith.github.io/xcode-man-pages/diskutil.8.html>.
+
+- List all currently available disks, partitions and mounted volumes:
+
+`diskutil list`
+
+- Repair the filesystem data structures of a volume:
+
+`diskutil repairVolume {{/dev/disk_device}}`
+
+- Unmount a volume:
+
+`diskutil unmountDisk {{/dev/disk_device}}`
+
+- Eject a CD/DVD (unmount first):
+
+`diskutil eject {{/dev/disk_device1}}`