qm-disk-import: add page; qm-importdisk: add alias page (#10499)

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/linux/qm-disk-import.md

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+# qm disk import
+
+> Import a disk image to a virtual machine as an unused disk.
+> The supported image formats for `qemu-img`, such as raw, qcow2, qed, vdi, vmdk, and vhd must be used.
+> More information: <https://pve.proxmox.com/pve-docs/qm.1.html>.
+
+- Import a VMDK/qcow2/raw disk image using a specific storage name:
+
+`qm importdisk {{vm_id}} {{path/to/disk}} {{storage_name}} --format {{qcow2|raw|vmdk}}`

pages/linux/qm-importdisk.md

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+# qm importdisk
+
+> This command is an alias of `qm disk import`.
+
+- View documentation for the original command:
+
+`tldr qm disk import`