Fix image alt text for helper creation in README.md

Author: andrew-codechimp

README.md

@@ -22,7 +22,7 @@ _If you want to show your support please_
 
 [!["Buy Me A Coffee"](https://www.buymeacoffee.com/assets/img/custom_images/yellow_img.png)](https://www.buymeacoffee.com/codechimp)
 
-![Helper Calendar Event](https://raw.githubusercontent.com/andrew-codechimp/ha-calendar-event/main/images/screenshot.png "Helper Calendar Event")
+![Helper Creation](https://raw.githubusercontent.com/andrew-codechimp/ha-calendar-event/main/images/screenshot.png "Helper Creation")
 
 ## Installation