fix(fmt): remove nightly-only fmt flags

rustfmt.toml

@@ -1,3 +1 @@
 edition = "2021"
-wrap_comments = true
-format_code_in_doc_comments = true

src/protocol.rs

@@ -191,8 +191,6 @@ pub enum Severity {
     Error,
 }
 
-
-
 #[cfg(feature = "serde")]
 #[test]
 fn test_serialize_severity() {

tests/graphical.rs

@@ -1855,7 +1855,7 @@ fn syntax_highlighter_on_real_file() {
     );
     assert!(out.contains("\u{1b}[38;2;180;142;173m"));
     assert_eq!(expected, strip_ansi_escapes::strip_str(out));
-  }
+}
 
 #[test]
 fn triple_adjacent_highlight() -> Result<(), MietteError> {