DOC: Added iloc dtype conversion behaviours

Author: zihengliao

pandas/core/indexing.py

@@ -183,6 +183,9 @@ def iloc(self) -> _iLocIndexer:
         out-of-bounds, except *slice* indexers which allow out-of-bounds
         indexing (this conforms with python/numpy *slice* semantics).
 
+        It is also worth noting, iloc converts all elements returned into the same pandas dtype and
+        all numeric dtype conversions follow the numpy promtion rules.
+
         See more at :ref:`Selection by Position <indexing.integer>`.
 
         See Also