fix(docs): highlight lines correction

Author: shenxiangzhuang

docs/tutorial/indexes.md

@@ -24,7 +24,7 @@ Fine, in that case, you can **sneak peek** the final code to create indexes here
 
 //// tab | Python 3.10+
 
-```Python hl_lines="8  10"
+```Python hl_lines="6  8"
 {!./docs_src/tutorial/indexes/tutorial002_py310.py!}
 ```