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Update AST validation module docs Drive-by doc update for AST validation pass: - Syntax extensions are replaced by proc macros. - Add rationale for why AST validation pass need to be run post-expansion and why the pass is needed in the first place. This was discussed during this week's [rustc-dev-guide reading club](https://rust-lang.zulipchat.com/#narrow/stream/196385-t-compiler.2Fwg-rustc-dev-guide), and the rationale was explained by cc ``````@bjorn3.``````