Add Rust 2021 prelude migration details#248

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jam1garner wants to merge 5 commits intorust-lang:masterfrom

jam1garner:master

Commits on Jul 2, 2021

Commits on Jul 5, 2021

Add cargo fix command to prelude migration section
jam1garner
committed

Commits on Jul 6, 2021

prototype an example-based approach to explaining the rewrites
nikomatsakis
committed

Commits on Jul 9, 2021

Merge pull request #1 from nikomatsakis/pr-248
jam1garner
authored