Auto merge of #9372 - weihanglo:missing-split-debuginfo-in-config, r=ehuss
Auto merge of #9372 - weihanglo:missing-split-debuginfo-in-config, r=ehuss

doc: add split-debuginfo doc in config chapter

Follow up for https://github.com/rust-lang/cargo/pull/9224.

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