Fix the trailing whitespace test

Author: SomeoneToIgnore

crates/ra_syntax/src/ast.rs

@@ -217,10 +217,7 @@ fn test_doc_comment_multi_line_block_strips_suffix() {
 #[test]
 fn test_comments_preserve_trailing_whitespace() {
     let file = SourceFile::parse(
-        r#"
-/// Representation of a Realm.
-/// In the specification these are called Realm Records.
-struct Realm {}"#,
+        "\n/// Representation of a Realm.   \n/// In the specification these are called Realm Records.\nstruct Realm {}",
     )
     .ok()
     .unwrap();