Docs: Fix for issue #6713 (#6775)

### What problem does this PR solve?

update fo issue #6713

### Type of change

- [x] Documentation Update

docs/references/http_api_reference.md

@@ -1167,7 +1167,7 @@ Success:
     "data": {
         "chunks": [
             {
-                "available_int": 1,
+                "available": true,
                 "content": "This is a test content.",
                 "docnm_kwd": "1.txt",
                 "document_id": "b330ec2e91ec11efbc510242ac120004",