docs(ecs): describe default tag value for fromEcrRepository method

[tam0ri]

Description of changes

If we don't specify the tag parameter for fromEcrRepository method, latest is used as default value.

aws-cdk/packages/aws-cdk-lib/aws-ecs/lib/container-image.ts

Lines 19 to 24 in c8e5924

	/**
	* Reference an image in an ECR repository
	*/
	public static fromEcrRepository(repository: ecr.IRepository, tag: string = 'latest') {
	return new EcrImage(repository, tag);
	}

However, currently this behavior is not described in document.
https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_ecs.ContainerImage.html#static-fromwbrecrwbrrepositoryrepository-tag

I'm adding the description regarding this default value.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[scanlonp]

Great! Going to remove the space and then approve.

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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).

Pull request has been modified.

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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).

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