Docs: Add example for expression option (#12694)

ArnaudBarre · Kai Cataldo · commit e3c570eaf3d1 · 2019-12-20T15:02:04.000-05:00
diff --git a/docs/rules/func-style.md b/docs/rules/func-style.md
@@ -77,6 +77,8 @@ Examples of **correct** code for this rule with the default `"expression"` optio
 var foo = function() {
     // ...
 };
+
+var foo = () => {};
 ```
 
 ### declaration
