fix(run): Help teach about argument escaping

It is not obvious that how to escape arguments to be forwarded literally to an underlying program,
like `--help`.

`cargo test` has a message:
```
Run `cargo test -- --help` for test binary options.
```

Mirroring that exactly in `cargo run` isn't appropriate because we'd be
saying there is `--help` when there might not be.

Instead, I took inspiration from clap's error message:
```console
$ cargo test --gfdfgdf
error: unexpected argument '--gfdfgdf' found

  tip: to pass '--gfdfgdf' as a value, use '-- --gfdfgdf'

Usage: cargo test [OPTIONS] [TESTNAME] [-- [ARGS]...]

For more information, try '--help'.
```

I checked `cargo rustc` and `cargo rustdoc` to see if they could be
helped like this but they will return errors about needing to specify
the specific binary, so they are a little more complicated.

Fixes #9707

Author: epage

src/bin/cargo/commands/run.rs

@@ -43,7 +43,8 @@ pub fn cli() -> Command {
         .arg_unit_graph()
         .arg_timings()
         .after_help(color_print::cstr!(
-            "Run `<bright-cyan,bold>cargo help run</>` for more detailed information.\n"
+            "Run `<bright-cyan,bold>cargo help run</>` for more detailed information.\n\
+             To pass `--help` to the specified binary, use `<bright-cyan,bold>-- --help</>`.\n",
         ))
 }