update whatsnew and add issue number

Author: peterpanmj

doc/source/whatsnew/v0.24.0.txt

@@ -493,6 +493,7 @@ ExtensionType Changes
 - :meth:`Series.combine()` with scalar argument now works for any function type (:issue:`21248`)
 - :meth:`Series.astype` and :meth:`DataFrame.astype` now dispatch to :meth:`ExtensionArray.astype` (:issue:`21185:`).
 - Added :meth:`pandas.api.types.register_extension_dtype` to register an extension type with pandas (:issue:`22664`)
+- Bug in :meth:`pandas.core.ops.dispatch_to_extension_op` where addition of ``Series`` of ``IntegerArray`` and ``IntegerArray`` values raise runtime exception (:issue `22478`)
 
 .. _whatsnew_0240.api.incompatibilities:
 

pandas/tests/arrays/test_integer.py

@@ -588,6 +588,7 @@ def test_cross_type_arithmetic():
 
 
 def test_arith_extension_array_values():
+    # GH 22478
     s = pd.Series([1, 2, 3], dtype='Int64')
     result = s + s.values
     expected = pd.Series([2, 4, 6], dtype='Int64')