Modified the help information of cargo-rustc
Modified the help information of cargo-rustc

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