Fix #579 - Add default values to documentation in API models

[kbeaugrand]

Description

What's new?

• Fix Story: As a developer, I Want to provide default values to my API's payloads #579

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Tests
• Other

[codecov]

Codecov Report

Merging #814 (91074f3) into main (8331cb9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #814   +/-   ##
=======================================
  Coverage   76.36%   76.36%           
=======================================
  Files         141      141           
  Lines        4756     4756           
=======================================
  Hits         3632     3632           
  Misses       1124     1124           

Impacted Files	Coverage Δ
...reIoTHub.Portal/Shared/Models/v1.0/DeviceConfig.cs	100.00% <ø> (ø)
...IoTHub.Portal/Shared/Models/v1.0/DeviceProperty.cs	100.00% <ø> (ø)
...AzureIoTHub.Portal/Shared/Models/v1.0/DeviceTag.cs	100.00% <ø> (ø)
...ortal/Shared/Models/v1.0/LoRaWAN/LoRaDeviceBase.cs	96.00% <ø> (ø)
.../Shared/Models/v1.0/LoRaWAN/LoRaDeviceModelBase.cs	100.00% <ø> (ø)

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