genfstab: add page (#5215)

pages/linux/genfstab.md

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+# genfstab
+
+> Generate output suitable for addition to an fstab file.
+> More information: <https://man.archlinux.org/man/extra/arch-install-scripts/genfstab.8>.
+
+- Display an fstab compatible output based on a volume label:
+
+`genfstab -L {{path/to/mount_point}}`
+
+- Display an fstab compatible output based on a volume UUID:
+
+`genfstab -U {{path/to/mount_point}}`
+
+- A usual way to generate an fstab file, requires root permissions:
+
+`genfstab -U {{/mnt}} >> {{/mnt/etc/fstab}}`
+
+- Append a volume into an fstab file to mount it automatically:
+
+`genfstab -U {{path/to/mount_point}} | sudo tee -a /etc/fstab`