update introduction.md

Author: SoYoung210

packages/storykit/src/stories/Introduction.mdx

@@ -32,7 +32,7 @@ npm install @storyprotocol/storykit @tanstack/react-query
 5 . Story Protocol api credentials must be defined in your environment variables, add them to the `.env.local`. For the Story Protocol api you can use the token provided below, although note that you may be required to change it in the future. For SimpleHash you can generate an api token for free at [simplehash.com](https://simplehash.com/).
 
 ```bash
-NEXT_PUBLIC_STORY_PROTOCOL_X_API_KEY="l0YkL0VIBK6-nfb7SGake4s3ctg="
+NEXT_PUBLIC_STORY_PROTOCOL_X_API_KEY="YOUR_STORY_PROTOCOL_API_KEY_HERE"
 NEXT_PUBLIC_SIMPLE_HASH_API_KEY="SIMPLEHASH_API_KEY_HERE"
 ```