docs: document official external commands

This documents external commands that are distributed along with
the Rust toolchain, including

* `cargo-clippy`
* `cargo-fmt`
* `cargo-miri`

The purpose of this is increasing the visibility of these tools,
and redirecting people to the correct place to discuss and learn them.

src/doc/src/SUMMARY.md

@@ -59,14 +59,17 @@
         * [cargo build](commands/cargo-build.md)
         * [cargo check](commands/cargo-check.md)
         * [cargo clean](commands/cargo-clean.md)
+        * [cargo clippy](commands/cargo-clippy.md)
         * [cargo doc](commands/cargo-doc.md)
         * [cargo fetch](commands/cargo-fetch.md)
         * [cargo fix](commands/cargo-fix.md)
+        * [cargo fmt](commands/cargo-fmt.md)
+        * [cargo miri](commands/cargo-miri.md)
+        * [cargo report](commands/cargo-report.md)
         * [cargo run](commands/cargo-run.md)
         * [cargo rustc](commands/cargo-rustc.md)
         * [cargo rustdoc](commands/cargo-rustdoc.md)
         * [cargo test](commands/cargo-test.md)
-        * [cargo report](commands/cargo-report.md)
     * [Manifest Commands](commands/manifest-commands.md)
         * [cargo add](commands/cargo-add.md)
         * [cargo generate-lockfile](commands/cargo-generate-lockfile.md)

src/doc/src/commands/build-commands.md

@@ -3,11 +3,14 @@
 * [cargo build](cargo-build.md)
 * [cargo check](cargo-check.md)
 * [cargo clean](cargo-clean.md)
+* [cargo clippy](cargo-clippy.md)
 * [cargo doc](cargo-doc.md)
 * [cargo fetch](cargo-fetch.md)
 * [cargo fix](cargo-fix.md)
+* [cargo fmt](cargo-fmt.md)
+* [cargo miri](cargo-miri.md)
+* [cargo report](cargo-report.md)
 * [cargo run](cargo-run.md)
 * [cargo rustc](cargo-rustc.md)
 * [cargo rustdoc](cargo-rustdoc.md)
 * [cargo test](cargo-test.md)
-* [cargo report](cargo-report.md)

src/doc/src/commands/cargo-clippy.md

@@ -0,0 +1,20 @@
+# cargo-clippy(1)
+
+## NAME
+
+cargo-miri --- Checks a package to catch common mistakes and improve your Rust code
+
+## DESCRIPTION
+
+This is an external command distributed with the Rust toolchain as an optional component.
+It is not built into Cargo, and may require additional installation.
+
+For information about usage and installation,
+see [Clippy Documentation](../../clippy/index.html).
+
+## SEE ALSO
+
+[cargo(1)](cargo.md),
+[cargo-fix(1)](cargo-fix.md),
+[cargo-fmt(1)](cargo-fmt.md),
+[Custom subcommands](../reference/external-tools.md#custom-subcommands)

src/doc/src/commands/cargo-fmt.md

@@ -0,0 +1,20 @@
+# cargo-fmt(1)
+
+## NAME
+
+carog-fmt --- Formats all bin and lib files of the current crate using rustfmt
+
+## DESCRIPTION
+
+This is an external command distributed with the Rust toolchain as an optional component.
+It is not built into Cargo, and may require additional installation.
+
+For information about usage and installation,
+see <https://github.com/rust-lang/rustfmt>.
+
+## SEE ALSO
+
+[cargo(1)](cargo.md),
+[cargo-fix(1)](cargo-fix.md),
+[cargo-clippy(1)](cargo-clippy.md),
+[Custom subcommands](../reference/external-tools.md#custom-subcommands)

src/doc/src/commands/cargo-miri.md

@@ -0,0 +1,22 @@
+# cargo-miri(1)
+
+## NAME
+
+cargo-miri --- Runs binary crates and tests in Miri
+
+## DESCRIPTION
+
+This is an external command distributed with the Rust toolchain as an optional component.
+It is not built into Cargo, and may require additional installation.
+
+This command is only available on the [nightly](https://doc.rust-lang.org/book/appendix-07-nightly-rust.html) channel.
+
+For information about usage and installation,
+see <https://github.com/rust-lang/miri>.
+
+## SEE ALSO
+
+[cargo(1)](cargo.md),
+[cargo-run(1)](cargo-run.md),
+[cargo-test(1)](cargo-test.md),
+[Custom subcommands](../reference/external-tools.md#custom-subcommands)