docs: fix vector store polling helper paths

Author: nightcityblade

helpers.md

@@ -510,9 +510,9 @@ The polling methods are:
 client.beta.threads.create_and_run_poll(...)
 client.beta.threads.runs.create_and_poll(...)
 client.beta.threads.runs.submit_tool_outputs_and_poll(...)
-client.beta.vector_stores.files.upload_and_poll(...)
-client.beta.vector_stores.files.create_and_poll(...)
-client.beta.vector_stores.file_batches.create_and_poll(...)
-client.beta.vector_stores.file_batches.upload_and_poll(...)
+client.vector_stores.files.upload_and_poll(...)
+client.vector_stores.files.create_and_poll(...)
+client.vector_stores.file_batches.create_and_poll(...)
+client.vector_stores.file_batches.upload_and_poll(...)
 client.videos.create_and_poll(...)
 ```