doc: change to chunk_token num (#8590)

### What problem does this PR solve?
https://github.com/infiniflow/ragflow/issues/8556

### Type of change

- [x] Documentation Update

docs/references/http_api_reference.md

@@ -881,7 +881,7 @@ curl --request PUT \
      {
           "name": "manual.txt", 
           "chunk_method": "manual", 
-          "parser_config": {"chunk_token_count": 128}
+          "parser_config": {"chunk_token_num": 128}
      }'
 
 ```
@@ -910,7 +910,7 @@ curl --request PUT \
 - `"parser_config"`: (*Body parameter*), `object`  
   The configuration settings for the dataset parser. The attributes in this JSON object vary with the selected `"chunk_method"`:  
   - If `"chunk_method"` is `"naive"`, the `"parser_config"` object contains the following attributes:
-    - `"chunk_token_count"`: Defaults to `256`.
+    - `"chunk_token_num"`: Defaults to `256`.
     - `"layout_recognize"`: Defaults to `true`.
     - `"html4excel"`: Indicates whether to convert Excel documents into HTML format. Defaults to `false`.
     - `"delimiter"`: Defaults to `"\n"`.

docs/references/python_api_reference.md

@@ -461,7 +461,7 @@ dataset = rag_object.list_datasets(id='id')
 dataset = dataset[0]
 doc = dataset.list_documents(id="wdfxb5t547d")
 doc = doc[0]
-doc.update([{"parser_config": {"chunk_token_count": 256}}, {"chunk_method": "manual"}])
+doc.update([{"parser_config": {"chunk_token_num": 256}}, {"chunk_method": "manual"}])
 ```
 
 ---