move simple_efficiency bugfix entry to v0.13.3 whatsnew

Author: aman-coder03

docs/sphinx/source/whatsnew/v0.14.0.rst

@@ -19,9 +19,7 @@ Deprecations
 
 
 Bug fixes
-* Fixed a division-by-zero error in
-  :py:func:`pvlib.transformer.simple_efficiency` when ``load_loss = 0``.
-  (:issue:`2645`, :pull:`2646`)
+
 
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