added whatsnew entry

Author: JanLauGe

doc/source/whatsnew/v0.22.0.txt

@@ -193,6 +193,7 @@ Other API Changes
 - Rearranged the order of keyword arguments in :func:`read_excel()` to align with :func:`read_csv()` (:issue:`16672`)
 - :func:`pandas.merge` now raises a ``ValueError`` when trying to merge on incompatible data types (:issue:`9780`)
 - :func:`wide_to_long` previously kept numeric-like suffixes as ``object`` dtype. Now they are cast to numeric if possible (:issue:`17627`)
+- comment arg is exposed as a named parameter in :func:`read_excel`
 
 .. _whatsnew_0220.deprecations: