Merge pull request #5371 from alphagov/secrets-docs-amendment

Minor clarification to the docs page about adding a new secret

Author: callumknights

source/kubernetes/manage-app/manage-secrets/index.html.md

@@ -32,7 +32,7 @@ You can create 2 types of secret in AWS Secrets Manager:
 
 ### Creating an AWS managed database secret
 
-1. Open the [AWS Secrets Manager console](https://eu-west-1.console.aws.amazon.com/secretsmanager/listsecrets?region=eu-west-1). You will need to sign in if you have not already.
+1. Open the [AWS Secrets Manager console](https://eu-west-1.console.aws.amazon.com/secretsmanager/listsecrets?region=eu-west-1). You will need to sign in and assume the `fulladmin` role if you have not already.
 
     You must create the secret in the 3 AWS accounts for integration, staging and production.
 
@@ -50,7 +50,7 @@ You can create 2 types of secret in AWS Secrets Manager:
 
 ### Creating a non-database secret
 
-1. Open the [AWS Secrets Manager console](https://eu-west-1.console.aws.amazon.com/secretsmanager/listsecrets?region=eu-west-1). You will need to sign in if you have not already.
+1. Open the [AWS Secrets Manager console](https://eu-west-1.console.aws.amazon.com/secretsmanager/listsecrets?region=eu-west-1). You will need to sign in and assume the `fulladmin` role if you have not already.
 
     You must create the secret in the 3 AWS accounts for integration, staging and production.