Minor updates

src/content/effective-dart/style.md

@@ -302,15 +302,17 @@ so their parameters must be named so that it's clear what each parameter is for,
 even if it isn't used.
 
 :::version-note
-Since Dart 3.7 `_` no longer creates a variable, so you can use `_` for
-multiple parameters simultaneously without name collision:
+Since Dart 3.7, the [wildcard variable `_`][] no longer creates a variable, so you can
+use `_` for multiple parameters simultaneously without name collision:
+
 ```dart tag=good
 (_, _) {
   print('error');
 }
 ```
 :::
 
+[wildcard variable `_`]: /language/variables#wildcard-variables
 
 ### DON'T use a leading underscore for identifiers that aren't private