docs(events-targets): add link for Run an ECS task section

[tam0ri]

README for aws-cdk-lib.aws_events_targets is missing the link for Run an ECS task section. This PR introduces the link.

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[lpizzinidev]

Thanks for the fix! 👍
Another adjustment to make on this README: this header should start with a capital letter (Enable Amazon...)

[scanlonp]

Good add

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Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

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• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 7318afc
• Result: SUCCEEDED
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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).