Add issue no. in test_format.py and add func ref

Author: thoo

doc/source/whatsnew/v0.24.0.txt

@@ -946,7 +946,7 @@ Other API Changes
 - :class:`DateOffset` attribute `_cacheable` and method `_should_cache` have been removed (:issue:`23118`)
 - Comparing :class:`Timedelta` to be less or greater than unknown types now raises a ``TypeError`` instead of returning ``False`` (:issue:`20829`)
 - :meth:`Index.hasnans` and :meth:`Series.hasnans` now always return a python boolean. Previously, a python or a numpy boolean could be returned, depending on circumstances (:issue:`23294`).
-- The order of the arguments of `DataFrame.to_html` and `DataFrame.to_string` is rearranged. (:issue:`23614`)
+- :func:The order of the arguments of `DataFrame.to_html` and `DataFrame.to_string` is rearranged to be consistent with each other. (:issue:`23614`)
 
 .. _whatsnew_0240.deprecations:
 

pandas/tests/io/formats/test_format.py

@@ -1452,6 +1452,7 @@ def test_to_string_format_na(self):
         assert result == expected
 
     def test_to_string_decimal(self):
+        #Issue #23614
         df = DataFrame({'A': [6.0, 3.1, 2.2]})
         expected = '     A\n0  6,0\n1  3,1\n2  2,2'
         assert df.to_string(decimal=',') == expected