Update prompt-management.mdx

Author: kathayl

src/content/docs/ai-gateway/configuration/prompt-management.mdx

@@ -22,7 +22,7 @@ Creating prompts in AI Gateway is done via the Cloudflare Dashboard or API.
     - Click on the **New Prompt** button.
     - Provide the following details:
       - Prompt name: A unique name to identify the prompt.
-      - Prompt : The instructions or text for the AI model.
+      - Prompt copy: The instructions or text for the AI model.
       - Tags: (Optional) Add tags to organize and search prompts easily.
 
 4.  Save the Prompt: