Added bug fix description to documentation.

Author: aijams

doc/source/whatsnew/v3.0.0.rst

@@ -1060,6 +1060,7 @@ Reshaping
 - Bug in :meth:`concat` where concatenating DataFrame and Series with ``ignore_index = True`` drops the series name (:issue:`60723`, :issue:`56257`)
 - Bug in :func:`melt` where calling with duplicate column names in ``id_vars`` raised a misleading ``AttributeError`` (:issue:`61475`)
 - Bug in :meth:`DataFrame.merge` where user-provided suffixes could result in duplicate column names if the resulting names matched existing columns. Now raises a :class:`MergeError` in such cases. (:issue:`61402`)
+- Bug in :meth:`DataFrame.merge` where the result of a merge does not contain any metadata or flag information from the inputs to the merge. (:issue:`28283`)
 
 Sparse
 ^^^^^^