add instruction regarding connect to eks

[msvticket]

Description

To simplify the module the terraform-aws-eks-jx module it doesn't run aws eks update-kubeconfig any more

Checklist:

• I have mentioned the appropriate type(scope), as referenced here in the commit message and PR title for the semantic checks to pass.
• I have signed off the commit, as per instructions mentioned here.
• Any dependent changes have already been merged.

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[jenkins-x-bot]

⭐ PR built and available in a preview jenkins-x-jx-docs-pr-3751 here

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[jenkins-x-bot]

⭐ PR built and available in a preview jenkins-x-jx-docs-pr-3751 here

[jenkins-x-bot]

⭐ PR built and available in a preview jenkins-x-jx-docs-pr-3751 here