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docs: clarify --pretty option to expand (#3810) 

* Update debugging.md

Added clarification. --pretty no longer works, and it breaks even on nightly at least on cargo 1.78.0-nightly (cdf84b69d 2024-02-02) and
rustc 1.78.0-nightly (256b6fb19 2024-02-06).

* Update guide/src/debugging.md

Co-authored-by: David Hewitt <mail@davidhewitt.dev>

---------

Co-authored-by: David Hewitt <mail@davidhewitt.dev>
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@ -16,7 +16,7 @@ You can also debug classic `!`-macros by adding `-Z trace-macros`:
cargo rustc --profile=check -- -Z unstable-options --pretty=expanded -Z trace-macros > expanded.rs; rustfmt expanded.rs
```
See [cargo expand](https://github.com/dtolnay/cargo-expand) for a more elaborate version of those commands.
Note that those commands require using the nightly build of rust and may occasionally have bugs. See [cargo expand](https://github.com/dtolnay/cargo-expand) for a more elaborate and stable version of those commands.
## Running with Valgrind