Improve code comments

Author: GuillaumeGomez

src/librustdoc/clean/types.rs

@@ -1084,7 +1084,7 @@ pub(crate) fn extract_cfg_from_attrs<'a, I: Iterator<Item = &'a hir::Attribute>
 
     let mut changed_auto_active_status = None;
 
-    // First we get all `doc(auto_cfg)` attributes.
+    // We get all `doc(auto_cfg)`, `cfg` and `target_feature` attributes.
     for attr in attrs {
         if let Some(ident) = attr.ident()
             && ident.name == sym::doc
@@ -1146,11 +1146,9 @@ pub(crate) fn extract_cfg_from_attrs<'a, I: Iterator<Item = &'a hir::Attribute>
                     }
                 }
             }
-        // If there is no `doc(cfg())`, then we retrieve the `cfg()` attributes (because
-        // `doc(cfg())` overrides `cfg()`).
         } else if let hir::Attribute::Parsed(AttributeKind::TargetFeature { features, .. }) = attr {
-            // treat #[target_feature(enable = "feat")] attributes as if they were
-            // #[doc(cfg(target_feature = "feat"))] attributes as well
+            // Treat `#[target_feature(enable = "feat")]` attributes as if they were
+            // `#[doc(cfg(target_feature = "feat"))]` attributes as well.
             for (feature, _) in features {
                 cfg_info.current_cfg &= Cfg::Cfg(sym::target_feature, Some(*feature));
             }