Add a chapter on all the identifiers used through `rustc`#872

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mark-i-m merged 4 commits intorust-lang:masterfrom

LeSeulArtichaut:rustc-ids

Sep 14, 2020

Commits on Sep 10, 2020

Commits on Sep 11, 2020

Make the HIR chapter point to the new chapter on IDs
LeSeulArtichaut
committed

Commits on Sep 12, 2020

Fix typo

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