Added file system creation to parted method

The file system has to be created after the partitioning is created using `parted`.

After the `parted` command, there is no file system:
```bash
$ sudo parted /dev/sdc --script mklabel gpt mkpart xfspart xfs 0% 100%
$ sudo parted /dev/sdc print
Model: Msft Virtual Disk (scsi)
Disk /dev/sdc: 68.7GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name     Flags
 1      1049kB  68.7GB  68.7GB               xfspart
```

Then a partition is created:
```bash
$ sudo mkfs.xfs /dev/sdc1
meta-data=/dev/sdc1              isize=512    agcount=4, agsize=4194176 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=16776704, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal log           bsize=4096   blocks=8191, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
$ sudo parted /dev/sdc print
Model: Msft Virtual Disk (scsi)
Disk /dev/sdc: 68.7GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name     Flags
 1      1049kB  68.7GB  68.7GB  xfs          xfspart
```

Author: kappmeier

articles/virtual-machines/linux/attach-disk-portal.md

@@ -174,6 +174,7 @@ Writing superblocks and filesystem accounting information: done
 The fdisk utility needs interactive input and hence is not ideal for use within automation scripts. However, the [parted](https://www.gnu.org/software/parted/) utility can be scripted and hence lends itself better in automation scenarios. The parted utility can be used to partition and to format a data disk. For the walkthrough below, we use a new data disk /dev/sdc and format it using the [XFS](https://xfs.wiki.kernel.org/) filesystem.
 ```bash
 sudo parted /dev/sdc --script mklabel gpt mkpart xfspart xfs 0% 100%
+sudo mkfs.xfs /dev/sdc1
 partprobe /dev/sdc1
 ```
 As seen above, we use the [partprobe](https://linux.die.net/man/8/partprobe) utility to make sure the kernel is immediately aware of the new partition and filesystem. Failure to use partprobe can cause the blkid or lslbk commands to not return the UUID for the new filesystem immediately.