test(embedded): Migrate to new syntax

tests/testsuite/script.rs

@@ -208,11 +208,10 @@ error: running `echo.rs` requires `-Zscript`
 #[cargo_test]
 fn clean_output_with_edition() {
     let script = r#"#!/usr/bin/env cargo
-
-//! ```cargo
-//! [package]
-//! edition = "2018"
-//! ```
+```cargo
+[package]
+edition = "2018"
+```
 
 fn main() {
     println!("Hello world!");
@@ -240,10 +239,9 @@ fn main() {
 #[cargo_test]
 fn warning_without_edition() {
     let script = r#"#!/usr/bin/env cargo
-
-//! ```cargo
-//! [package]
-//! ```
+```cargo
+[package]
+```
 
 fn main() {
     println!("Hello world!");
@@ -625,11 +623,10 @@ fn missing_script_rs() {
 fn test_name_same_as_dependency() {
     Package::new("script", "1.0.0").publish();
     let script = r#"#!/usr/bin/env cargo
-
-//! ```cargo
-//! [dependencies]
-//! script = "1.0.0"
-//! ```
+```cargo
+[dependencies]
+script = "1.0.0"
+```
 
 fn main() {
     println!("Hello world!");
@@ -662,11 +659,10 @@ fn main() {
 #[cargo_test]
 fn test_path_dep() {
     let script = r#"#!/usr/bin/env cargo
-
-//! ```cargo
-//! [dependencies]
-//! bar.path = "./bar"
-//! ```
+```cargo
+[dependencies]
+bar.path = "./bar"
+```
 
 fn main() {
     println!("Hello world!");