Add documentation for API playground prefill feature (#1461)

* Update organize/settings.mdx

* Update api-playground/overview.mdx

* Update api-playground/overview.mdx

* Apply suggestions from code review

* Update api-playground/overview.mdx

Co-authored-by: Kathryn Isabelle Lawrence <[email protected]>

---------

Co-authored-by: mintlify[bot] <109931778+mintlify[bot]@users.noreply.github.com>
Co-authored-by: Ethan Palm <[email protected]>
Co-authored-by: Kathryn Isabelle Lawrence <[email protected]>

Author: 3 people

api-playground/overview.mdx

@@ -101,6 +101,9 @@ You can customize your API playground by defining the following properties in yo
         <ResponseField name="defaults" type="&quot;required&quot; | &quot;all&quot;">
         Whether to show optional parameters in API examples. Defaults to `all`.
     </ResponseField>
+    <ResponseField name="prefill" type="boolean">
+        Whether to prefill the API playground with data from schema examples. When enabled, the playground automatically populates request fields with example values from your OpenAPI specification. Defaults to `false`.
+    </ResponseField>
     </Expandable>
 </ResponseField>
 
@@ -114,13 +117,14 @@ You can customize your API playground by defining the following properties in yo
    },
    "examples": {
      "languages": ["curl", "python", "javascript"],
-     "defaults": "required"
+     "defaults": "required",
+     "prefill": true
    }
  }
 }
 ```
 
-This example configures the API playground to be interactive with example code snippets for cURL, Python, and JavaScript. Only required parameters are shown in the code snippets.
+This example configures the API playground to be interactive with example code snippets for cURL, Python, and JavaScript. Only required parameters are shown in the code snippets, and the playground prefills the request body with example values.
 
 ### Custom endpoint pages
 

organize/settings.mdx

@@ -669,6 +669,9 @@ See [Themes](themes) for more information.
          <ResponseField name="defaults" type="&quot;required&quot; | &quot;all&quot;">
           Whether to show optional parameters in API examples. Defaults to `all`.
         </ResponseField>
+        <ResponseField name="prefill" type="boolean">
+          Whether to prefill the API playground with data from schema examples. When enabled, the playground automatically populates request fields with example values from your OpenAPI specification. Defaults to `false`.
+        </ResponseField>
       </Expandable>
     </ResponseField>
     <ResponseField name="mdx" type="object">