Display alias target on 'cargo help <alias>`. Closes #10138
Display alias target on 'cargo help <alias>`. Closes #10138

Previously, `cargo help <alias>` resolved the alias and displayed the
help for the targeted subcommand. For example, if `br` were aliased to
`build --release`, `cargo help br` would display the manpage for
cargo-build.

With this patch, it will print "'br' is aliased to 'build --release'".

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