[PR #6889/a6486774 backport][3.8] Export PrefixedSubAppResource
in aiohttp.web
#6921
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This is a backport of PR #6889 as merged into master (a648677).
To match the documentation: https://docs.aiohttp.org/en/stable/web_reference.html#aiohttp.web.PrefixedSubAppResource
It's missing since this PR got merged: #3469.