Title correction

Author: Karuna-Mendix

content/en/docs/marketplace/genai/how-to/prompt_engineering-runtime.md

@@ -84,7 +84,7 @@ You can now create your first agent in the user interface. The final agent will
 
     The agent cannot be edited anymore.
 
-### Iterate and First Test Case
+### Iteration and First Test Case
 
 To further improve your prompts and the user experience for the end users, you can now add some placeholder variables.