chore: show fix command when rustfmt check fails

Author: CuteChuanChuan

ci/scripts/rust_fmt.sh

@@ -24,4 +24,7 @@ rustup toolchain install nightly --component rustfmt
 
 # Use nightly rustfmt to check formatting including doc comments
 # This requires nightly because format_code_in_doc_comments is an unstable feature
-cargo +nightly fmt --all -- --check --config format_code_in_doc_comments=true
+if ! cargo +nightly fmt --all -- --check --config format_code_in_doc_comments=true; then
+    echo "To fix, run: cargo +nightly fmt --all -- --config format_code_in_doc_comments=true"
+    exit 1
+fi