Typo in Device model

[grncbg]

Deployment Type

Self-hosted

NetBox Version

v3.7.2

Python Version

3.8

Steps to Reproduce

error message is defined as "A U0 device type ...", but I think the correct definition is "A 0U device type ...".

https://github.com/netbox-community/netbox/blob/011bc5bd78229122341bf21f0774662413dd8ba0/netbox/dcim/models/devices.py#L873-L880

Expected Behavior

A 0U device type ({device_type}) cannot be assigned to a rack position.

Observed Behavior

A U0 device type ({device_type}) cannot be assigned to a rack position.