Docs: update API endpoint paths (#9683)

### What problem does this PR solve?

- Update API endpoint paths in docs from `/v1/` to `/api/v1/` for
consistency

### Type of change

- [x] Documentation Update

docs/references/http_api_reference.md

@@ -3501,7 +3501,7 @@ Failure:
 
 ### Generate related questions
 
-**POST** `/v1/sessions/related_questions`
+**POST** `/api/v1/sessions/related_questions`
 
 Generates five to ten alternative question strings from the user's original query to retrieve more relevant search results.
 
@@ -3516,7 +3516,7 @@ The chat model autonomously determines the number of questions to generate based
 #### Request
 
 - Method: POST
-- URL: `/v1/sessions/related_questions`
+- URL: `/api/v1/sessions/related_questions`
 - Headers:
   - `'content-Type: application/json'`
   - `'Authorization: Bearer <YOUR_LOGIN_TOKEN>'`
@@ -3528,7 +3528,7 @@ The chat model autonomously determines the number of questions to generate based
 
 ```bash
 curl --request POST \
-     --url http://{address}/v1/sessions/related_questions \
+     --url http://{address}/api/v1/sessions/related_questions \
      --header 'Content-Type: application/json' \
      --header 'Authorization: Bearer <YOUR_LOGIN_TOKEN>' \
      --data '