Document that [replace] should not be used.
Document that [replace] should not be used.

cc #7092

rustyhorde/cargo,tshepang/cargo,nipunn1313/cargo,rust-lang/cargo,rustyhorde/cargo,rustyhorde/cargo,tsurai/cargo,rust-lang/cargo,tsurai/cargo,vojtechkral/cargo,nipunn1313/cargo,rust-lang/cargo,vojtechkral/cargo,rust-lang/cargo,rustyhorde/cargo,tsurai/cargo,tsurai/cargo,tshepang/cargo,eminence/cargo,vojtechkral/cargo,tsurai/cargo,vojtechkral/cargo,eminence/cargo,nipunn1313/cargo,eminence/cargo,tshepang/cargo,nipunn1313/cargo,tshepang/cargo,eminence/cargo