Updated RESTful API Reference (#908)

### What problem does this PR solve?

_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._

### Type of change

- [x] Documentation Update

docs/references/_category_.json

@@ -1,6 +1,6 @@
 {
   "label": "References",
-  "position": 1,
+  "position": 3,
   "link": {
     "type": "generated-index",
     "description": "RAGFlow References"