Merge pull request #82 from WPO-Foundation/jefflembeck-patch-1

fix(api): change curl command in docs

Author: jefflembeck

src/api/index.md

@@ -21,14 +21,14 @@ To make sure your API key is ready to go, let's get your first test submitted. I
 Copy and paste the following command into your terminal, inserting your api key in place of the placeholders:
 
 ```bash
-curl https://www.webpagetest.org/runtest.php?url=https://www.webpagetest.org&k={YOUR_API_KEY}&f=json
+curl --request POST --url 'https://www.webpagetest.org/runtest.php?&url=https%3A%2F%2Fwww.webpagetest.org&f=json' --header 'X-WPT-API-KEY: {YOUR_API_KEY}'
 ```
 
 The request above will:
 
 - Submit a test for www.webpagetest.org (using the `url` parameter)
-- Authenticate using your API key (using the `k` parameter)
 - Request a JSON response (using the `f` parameter)
+- Authenticate using your API key (using the `X-WPT-API-KEY` header)
 
 If all goes well, you should get a JSON response, similar to the one below, telling you the test has been successfully submitted (`statusCode`=200), and providing you with the `testId` as well as several links for digging into results once the test has been completed.