fix(#131): typo

Author: h1alexbel

src/main/java/git/tracehub/codereview/action/openai/OpenRequest.java

@@ -50,10 +50,10 @@ public final class OpenRequest implements Scalar<Request> {
     @Override
     public Request value() throws Exception {
         return new JdkRequest(
-            "https://api.openai.com/v1/chat/completions"
+            "https://api.openai.com/v1/completions"
         ).method("POST")
-            .header("Authorization", String.format("Bearer %s", this.token))
             .header("Content-Type", "application/json")
+            .header("Authorization", String.format("Bearer %s", this.token))
             .body()
             .set(this.body.value())
             .back();