style(rust): document declaration ordering

src/xatu/rules.rs

@@ -6,6 +6,12 @@ use crate::rules::empty_inherit::EmptyInherit;
 pub mod deprecated_to_path;
 pub mod empty_inherit;
 
+#[derive(Debug)]
+pub struct Diagnostic {
+    pub file_id: FileId,
+    pub finding: Finding,
+}
+
 #[derive(Debug)]
 pub struct Finding {
     pub rule_id: &'static str,
@@ -13,12 +19,6 @@ pub struct Finding {
     pub message: &'static str,
 }
 
-#[derive(Debug)]
-pub struct Diagnostic {
-    pub file_id: FileId,
-    pub finding: Finding,
-}
-
 impl std::fmt::Display for Diagnostic {
     fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         write!(