Update src/content/docs/browser-rendering/rest-api/pdf-endpoint.mdx

Co-authored-by: ToriLindsay <[email protected]>

Author: kathayl

src/content/docs/browser-rendering/rest-api/pdf-endpoint.mdx

@@ -15,7 +15,7 @@ The `/pdf` endpoint instructs the browser to generate a PDF of a webpage or cust
 https://api.cloudflare.com/client/v4/accounts/<accountId>/browser-rendering/pdf
 ```
 
-## Required Fields
+## Required fields
 You must provide either `url` or `html`:
 -  `url` (string)
 -  `html` (string)