WHY
For RHOAM to send emails on ROSA private link cluster the sendgrid IP address need to be allowed through the fire wall.

WHAT
The IP address need for SendGrid need to be officially documented for the different regions of AWS

HOW
The jira MGADPI-5582 outcomes outline the required IPs that need to be document.

TESTS
<List of related tests>

DONE
Public facing documentation is updated with the sendgrid IPs required for private link cluster