add - in whatsnew

Author: charlesdong1991

doc/source/whatsnew/v0.25.0.rst

@@ -18,7 +18,7 @@ including other versions of pandas.
 
 Other Enhancements
 ^^^^^^^^^^^^^^^^^^
-:func:`DataFrame.plot` keywords ``logy``, ``logx`` and ``loglog`` can now accept the value ``sym`` for symlog scaling. (:issue:`24867`)
+- :func:`DataFrame.plot` keywords ``logy``, ``logx`` and ``loglog`` can now accept the value ``sym`` for symlog scaling. (:issue:`24867`)
 
 
 .. _whatsnew_0250.api_breaking: