feat(docs): Update translations in custom-directives.md

correction of a typo in the text #2

src/guide/reusability/custom-directives.md

@@ -120,7 +120,7 @@ app.directive('highlight', {
 
 ```vue
 <script setup>
-// включение v-highlight в шаблоне
+// включение v-focus в шаблоне
 const vFocus = {
   mounted: (el) => el.focus()
 }