Change wording form layered to cross-stack references

[rezabekf]

What does this PR do and why?

This PR changes the wording to be consistent with AWS terminology.

Issue #, if available

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• [x] Added/Updated documentation if applicable.
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[rezabekf]

@cmick-aws, could you please review Japanese translation for this change? I have updated static files links, however the text will need to be done by you or your team. Thank you!

[cmick-aws]

@rezabekf , Please let me apply corresponding changes to the other PRs.