docs(natu): clarify let-order locations

src/natu/natu.rs

@@ -56,7 +56,7 @@ impl std::fmt::Display for Report {
                         finding.finding.expected_order.as_ref().expect("let order");
                     writeln!(
                         formatter,
-                        "  bindings starting at line {start}: {}",
+                        "  let whose first binding starts at line {start}: {}",
                         expected_order.join(", ")
                     )?;
                 }