Add STS Workflow details

[luisuxcli]

The user guide covers all the various settings included in the solution to support STS but does not go over these steps in detail. Although this can be covered during the onboarding and demo of the solution it could be helpful to have the workflow steps outlined. Merchants who meet the use case or elect to use this feature can then more quickly and easily configure and test STS workflows without the need to sift through the entire user guide.

[dobooth]

https://docs.aws.amazon.com/STS/latest/APIReference/welcome.html

[shrielenee]

@luisuxcli Here is the store fulfillment guide: https://experienceleague.adobe.com/docs/commerce-merchant-services/store-fulfillment/introduction.html?lang=en

Can you give us more direction on which topic(s) you were experiencing a deficiency?