docs: remove CORS credential header

Author: lidel

README.md

@@ -72,7 +72,6 @@ Run the **[cors-config.sh](./cors-config.sh)** script with:
 ```console
 > ipfs config --json API.HTTPHeaders.Access-Control-Allow-Origin '["http://localhost:3000", "https://webui.ipfs.io"]'
 > ipfs config --json API.HTTPHeaders.Access-Control-Allow-Methods '["PUT", "GET", "POST"]'
-> ipfs config --json API.HTTPHeaders.Access-Control-Allow-Credentials '["true"]'
 ```
 
 #### Reverting