[OpenCore Install Guide] "disk image" property does not appear in output of "dmg2img -l BaseSystem.dmg"

Title explains it mostly. When I run dmg2img -l BaseSystem.dmg, this is the output:
```
dmg2img v1.6.7 (c) vu1tur (to@vu1tur.eu.org)

BaseSystem.dmg --> (partition list)

partition 0: MBR
partition 1: Primary GPT Header
partition 2: Primary GPT Table
partition 3: Apple_HFS
partition 4: Apple_Free
partition 5: Backup GPT Table
partition 6: Backup GPT Header
```

This is the expected output (from the guide): https://dortania.github.io/OpenCore-Install-Guide/assets/img/unknown-20.7e0e5028.png

It is probably due to update to `dmg2img`, not because of Apple. These are actually present in the expected output (inside the parenthesis), with more information that causes confusion to beginners. It should be updated to avoid confusion.