docs: add example for bgGradient based on tokens

[R0bson]

Related to: #1656

📝 Description

Improved documentation for using bgGradient.

⛳️ Current behavior (updates)

Usage of gradients is not intuitive since it doesn't work with backgroundImage. Better documentation needed.

🚀 New behavior

Added documentation examples for using bgGradient based on tokens.

💣 Is this a breaking change (Yes/No):

No

[changeset-bot]

⚠️ No Changeset found

Latest commit: 5b26860

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