[Bug]: dab update truncates field descriptions at commas

[JerryNixon]

Expected

Quoted field descriptions should preserve commas.

dab update ServerInventory \
  --fields.name Environment \
  --fields.description "Deployment environment: Prod, Dev, Test, or UAT"

Expected config:

"description": "Deployment environment: Prod, Dev, Test, or UAT"

Actual

The description is truncated at the first comma.

"description": "Deployment environment: Prod"

This makes the CLI unreliable for scripting realistic descriptions, especially descriptions that list valid values.