doc: sync comparison

Co-authored-by: Adam Reichold <adamreichold@users.noreply.github.com>

guide/src/migration.md

@@ -36,7 +36,7 @@ fn main() {
 
 Before, the above code would have printed `RuntimeError('ValueError: original error message')`, which might be confusing.
 
-After, the same code will print `ValueError: Rust Value Error`, which is more straightforward.
+After, the same code will print `ValueError: original error message`, which is more straightforward.
 
 However, if the `anyhow::Error` or `eyre::Report` has a source, then the original exception will still be wrapped in a `PyRuntimeError`.