docs(cloud): document AWS roles restricted to specific regions

[mayankpande88]

Description

Summary

The AWS page told readers "Do not add a region condition" to the IAM role. That is out of date: a role restricted to specific regions works once the account is given an AWS Regions list, and the page never mentioned that setting. A reader with a region-restricted role got an account that connects and then stays empty, with nothing on the page pointing to the fix.

The page now gives:

• a section on restricting the role to specific regions: why the list is needed, where to set it (when connecting, or Edit AWS Regions on a connected account), and which services stop working
• the AWS Regions (optional) field in the common fields and in the IAM Role ARN and Access Keys steps
• a troubleshooting entry for "The account connects but no resources or alarms appear"

It also drops the Access Keys step that asked for an AWS Region field; the form no longer has one.

Edit AWS Regions is not in every self-hosted release yet; the page tells those readers to upgrade or contact support.

Type of change

• Update to existing documentation

How Has This Been Tested?

Open the Amazon Web Services page in a local build of the site: the new section sits after the Option B policy document, the links to it from "Trimming it safely" and "Troubleshooting" jump to it, and the troubleshooting entry links back to the permissions policy.

Checklist

• I ran npm run build locally and the site builds without errors
• I ran npm run lint locally and lint passes
• Internal links work; new external links open the correct page
• My commits are signed off (DCO — git commit -s)
• I read CONTRIBUTING.md

Local e2e: n/a — documentation only; the site build and lint pass.

[gemini-code-assist]

Code Review

This pull request updates the AWS integration documentation to explain how to restrict IAM roles or users to specific AWS regions using the new optional "AWS Regions" setting in NudgeBee. It details how this setting avoids region lookup failures and adds a troubleshooting section for empty accounts caused by region restrictions. The feedback suggests a minor rephrasing to improve the readability of a sentence explaining the behavior of global services when us-east-1 is not allowed.