Update doctests/query_vector.py

Co-authored-by: Tyler Hutcherson <tyler.hutcherson@redis.com>

Author: dwdougherty

doctests/query_vector.py

@@ -64,5 +64,5 @@ def embed_text(model, text):
 
 # REMOVE_START
 # destroy index and data
-r.ft("idx:bicycle").dropindex(delete_documents=True)
+index.delete(drop=True)
 # REMOVE_END