docs: add info how to get layer versions from the SAR for the layers #134

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am29d wants to merge 3 commits intoaws-powertools:developfrom

am29d:docs/add-sar-list-versions

Commits on Aug 26, 2020

improved docs with cli command to fetch available layer versions from SAR
Alex Melnyk
committed
add section where to find the Layer ARN
Alex Melnyk
committed
fix inline formatting
Alex Melnyk
committed