Fix what's new: remove extra line and add notable_bug_fixes line

Author: Lucas

doc/source/whatsnew/v1.5.0.rst

@@ -390,6 +390,8 @@ upon serialization. (Related issue :issue:`12997`)
     pd.read_json(a.to_json(date_format='iso'), typ="series").index == a.index
 
 
+.. _whatsnew_150.notable_bug_fixes.groupby_value_counts_categorical:
+
 DataFrameGroupBy.value_counts with non-grouping categorical columns and ``observed=True``
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
@@ -853,7 +855,6 @@ Categorical
 ^^^^^^^^^^^
 - Bug in :meth:`Categorical.view` not accepting integer dtypes (:issue:`25464`)
 - Bug in :meth:`CategoricalIndex.union` when the index's categories are integer-dtype and the index contains ``NaN`` values incorrectly raising instead of casting to ``float64`` (:issue:`45362`)
-- Bug in :meth:`.DataFrameGroupBy.value_counts` includes non-observed categories of non-grouping columns regardless of ``observed`` (:issue:`46357`)
 
 Datetimelike
 ^^^^^^^^^^^^