Auto merge of #9070 - joshtriplett:opt-level-vs-debug, r=Eh2406
Auto merge of #9070 - joshtriplett:opt-level-vs-debug, r=Eh2406

Remove statement that opt-level 0 turns on debug

See https://github.com/rust-lang/cargo/pull/9020#issuecomment-751513035

eminence/cargo,eminence/cargo,nipunn1313/cargo,nipunn1313/cargo,rust-lang/cargo,eminence/cargo,rustyhorde/cargo,eminence/cargo,nipunn1313/cargo,rust-lang/cargo,rustyhorde/cargo,rustyhorde/cargo,nipunn1313/cargo,rust-lang/cargo,rustyhorde/cargo,rust-lang/cargo