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Rollup merge of #143659 - GrigorenkoPV:attributes/inner-outer, r=jdonszelmann
Use "Innermost" & "Outermost" terminology for `AttributeOrder`
Follow-up to rust-lang/rust#143603.
https://rust-lang.zulipchat.com/#narrow/channel/131828-t-compiler/topic/attribute.20parsing.20rework/near/527768926
Also remove some outdated comments. cc `@jdonszelmann`