chore: fix doc

ota-meshi · ota-meshi · commit 95d74a66efb5 · 2024-04-03T11:24:58.000+09:00
diff --git a/docs/rules/key-format-style.md b/docs/rules/key-format-style.md
@@ -113,6 +113,8 @@ appTitle: I18N Management System
 app_title: I18N Management System
 ```
 
+</eslint-code-block>
+
 :+1: Examples of **correct** code for this rule with `"lowercase"`:
 
 <eslint-code-block language="yaml">
