Update bug fix references in v0.15.1 release notes

Author: r0hansaxena

docs/sphinx/source/whatsnew/v0.15.1.rst

@@ -16,7 +16,7 @@ Bug fixes
 ~~~~~~~~~
 * Fix a bug in :py:func:`pvlib.scaling.latlon_to_xy` where latitude
   scaling was incorrectly applied to both latitude and longitude components.
-  (:issue:`2614`, :pull:` `)
+  (:issue:`2614`, :pull:`2712`)
 * Fix a division-by-zero condition in
   :py:func:`pvlib.transformer.simple_efficiency` when ``load_loss = 0``.
   (:issue:`2645`, :pull:`2646`)