fix typo: 'assotiated' -> 'associated'

en/src/method.md

@@ -195,7 +195,7 @@ struct TrafficLight {
 }
 
 impl TrafficLight {
-    // 1. Implement an assotiated function `new`,
+    // 1. Implement an associated function `new`,
     // 2. It will return a TrafficLight contains color "red"
     // 3. Must use `Self`, DONT use `TrafficLight` in fn signatures or body
     pub fn new()