Update whatsnew

Co-authored-by: Kevin Anderson <kevin.anderso@gmail.com>

Author: AdamRJensen

docs/sphinx/source/whatsnew/v0.15.2.rst

@@ -37,9 +37,9 @@ Bug fixes
   :py:mod:`csv` module instead of a naive ``str.split(',')``, so quoted column
   names containing commas (e.g. the material names in spectral-on-demand files)
   are no longer split into spurious columns. (:issue:`2736`, :pull:`2771`)
-* Remove ``data_version`` parameter from
+* Deprecate ``data_version`` parameter of
   :py:func:`~pvlib.iotools.get_meteonorm_tmy` as this parameter is no longer
-  supported and results in an error. (:pull:`2781`)
+  supported by the Meteonorm API. (:pull:`2781`)
 
 Enhancements
 ~~~~~~~~~~~~