chore: update comments

Author: yuxqiu

clippy_lints/src/methods/map_unwrap_or_default.rs

@@ -17,20 +17,21 @@ pub(super) fn check<'tcx>(
     unwrap_recv: &'tcx rustc_hir::Expr<'_>,
     msrv: &Msrv,
 ) {
+    // Don't lint if:
+
+    // 1. the `expr` is generated by a macro
     if expr.span.from_expansion() {
         return;
     }
 
-    // Lint if:
-
-    // 1. the caller of `map()` is an `Option` or `Result`
+    // 2. the caller of `map()` is neither `Option` nor `Result`
     let is_option = is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(map_recv), sym::Option);
     let is_result = is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(map_recv), sym::Result);
     if !is_option && !is_result {
         return;
     }
 
-    // 2. the `map_arg` maps `T` to `bool`
+    // 3. the `map_arg` function/closure doesn't return `bool`
     let map_arg_return_bool = expr_sig(cx, map_arg).is_some_and(|fn_sig| {
         fn_sig
             .output()
@@ -40,7 +41,7 @@ pub(super) fn check<'tcx>(
         return;
     }
 
-    // 3. msrv meets `OPTION_IS_SOME_AND` and `RESULT_IS_OK_AND`
+    // 4. msrv doesn't meet either `OPTION_IS_SOME_AND` or `RESULT_IS_OK_AND`
     if !msrv.meets(OPTION_IS_SOME_AND) || !msrv.meets(RESULT_IS_OK_AND) {
         return;
     }