add gh number

Author: topper-123

doc/source/whatsnew/v1.2.0.rst

@@ -346,7 +346,7 @@ Performance improvements
 - Performance improvement in :meth:`RollingGroupby.count` (:issue:`35625`)
 - Small performance decrease to :meth:`Rolling.min` and :meth:`Rolling.max` for fixed windows (:issue:`36567`)
 - Reduced peak memory usage in :meth:`DataFrame.to_pickle` when using ``protocol=5`` in python 3.8+ (:issue:`34244`)
-- faster `dir` calls when many index labels, e.g. `dir(ser)` (:issue:`xxxxx`)
+- faster ``dir`` calls when many index labels, e.g. ``dir(ser)`` (:issue:`37450`)
 - Performance improvement in :class:`ExpandingGroupby` (:issue:`37064`)
 
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