chore: updates container-definition user jsdoc

[MichaelLeeHobbs]

Update JSDOC for user to clarify that this is a user string and not restricted to a user name.

Reason for this change: When viewing the documentation from an IDE it is unclear that something other than a user name can be used for example 100:101 ie UID and GID.

I have not fully read the following:

This commit/pull request only changes JSDoc.

Closes #26230

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[mrgrain]

aws-cdk-lib: /codebuild/output/src1382825181/src/github.com/aws/aws-cdk/packages/aws-cdk-lib/aws-ecs/lib/container-definition.ts
aws-cdk-lib:   298:5  error  Trailing spaces not allowed  no-trailing-spaces

Pull request has been modified.

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