fix(docs): modify import statement typo (#47)

Author: 2yunseong

docs/offlegacy.org/src/content/ko/docs/why-event-tracker.mdx

@@ -154,7 +154,7 @@ const [Track, useTracker] = createTracker({
 
 ```tsx {13-20, 24-33}
 import { z } from "zod";
-import { createTracker } from "@offlegacy/Event Tracker";
+import { createTracker } from "@offlegacy/event-tracker";
 
 interface Context {
   /* ... */