fix: use correct gh api command for starring repository

Author: gracefullight

README.ko.md

@@ -391,5 +391,5 @@ MIT
 또는 스타를 남겨주세요:
 
 ```bash
-gh repo star first-fluke/fullstack-starter
+gh api --method PUT /user/starred/first-fluke/fullstack-starter --input /dev/null
 ```

README.md

@@ -391,5 +391,5 @@ If this project helped you, please consider buying me a coffee!
 Or leave a star:
 
 ```bash
-gh repo star first-fluke/fullstack-starter
+gh api --method PUT /user/starred/first-fluke/fullstack-starter --input /dev/null
 ```