Fix usage text for cargo install
Fix usage text for cargo install

The current text was accidentally copied from `cargo init`.

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