docs: updating v3->v4 migration docs with fee middleware#2127

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damiannolan merged 5 commits intomainfrom sean/issue#2089-fee-middleware-migration-docs

Sep 26, 2022

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Commits on Sep 21, 2022

Commits on Sep 26, 2022

Merge branch 'main' into sean/issue#2089-fee-middleware-migration-docs
damiannolan
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