Update chain migration docs to use v0.42 (backport #9090)#9317

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amaury1093 merged 1 commit intorelease/v0.42.xfrom mergify/bp/release/v0.42.x/pr-9090

May 12, 2021

+14-10

Commits on May 12, 2021

Update chain migration docs to use v0.42 (#9090 )

amaury1093
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