Response: Clarify what http_response_code(200); is
Response: Clarify what http_response_code(200); is

Add a comment explaining how HTTP status code 200 means success.

Cherry-picked from master 4606553f38909b483bc06674f9558ede1a9ff1f6.

ewhal/gpomf,alucard0134/Pomf,pomf/pomf,alucard0134/Pomf,pomf/pomf,pomf/pomf-php,alucard0134/Pomf