Split test_python_types.cpp into builtin_casters, stl and pytypes
diff --git a/docs/advanced/cast/stl.rst b/docs/advanced/cast/stl.rst
index 47c2a96..23e6751 100644
--- a/docs/advanced/cast/stl.rst
+++ b/docs/advanced/cast/stl.rst
@@ -23,7 +23,7 @@
 
 .. seealso::
 
-    The file :file:`tests/test_python_types.cpp` contains a complete
+    The file :file:`tests/test_stl.cpp` contains a complete
     example that demonstrates how to pass STL data types in more detail.
 
 C++17 library containers