docs(contrib): change clap URL to docs.rs/clap (#15682)

### What does this PR try to resolve?

The current [subcommands
page](https://doc.crates.io/contrib/implementation/subcommands.html) in
Cargo contrib guide links clap to https://clap.rs, which doesn't exist.
This PR updates that link to https://docs.rs/clap, which is the URL
mentioned in [clap's repository](https://github.com/clap-rs/clap)

### How to test and review this PR?
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@ -17,7 +17,7 @@ automatically search for a subcommand named `cargo-{NAME}` in the users `PATH`
to execute the subcommand.
[`clap`]: https://clap.rs/
[`clap`]: https://docs.rs/clap
[`src/bin/cargo/commands/build.rs`]: https://github.com/rust-lang/cargo/tree/master/src/bin/cargo/commands/build.rs
[`src/cargo/ops`]: https://github.com/rust-lang/cargo/tree/master/src/cargo/ops
[`src/bin/cargo/commands`]: https://github.com/rust-lang/cargo/tree/master/src/bin/cargo/commands