Docs: Add documentation to add Lambda Layer ARN in China

[leandrodamascena]

What were you searching in the docs?

We need to modify our documentation to add Lambda Layer ARN in China.

#5269

Is this related to an existing documentation section?

No response

How can we improve?

Add Layer ARN.

Got a suggestion in mind?

No response

Acknowledgment

• I understand the final update might be different from my proposed suggestion, or refused.