Backport PR #35801: DOC: another pass of v1.1.1 release notes (#35822)

Co-authored-by: Simon Hawkins <simonjayhawkins@gmail.com>

doc/source/whatsnew/v1.1.1.rst

@@ -1,6 +1,6 @@
 .. _whatsnew_111:
 
-What's new in 1.1.1 (August XX, 2020)
+What's new in 1.1.1 (August 20, 2020)
 -------------------------------------
 
 These are the changes in pandas 1.1.1. See :ref:`release` for a full changelog
@@ -27,7 +27,7 @@ Fixed regressions
 - Fixed regression in ``.groupby(..).rolling(..)`` where a segfault would occur with ``center=True`` and an odd number of values (:issue:`35552`)
 - Fixed regression in :meth:`DataFrame.apply` where functions that altered the input in-place only operated on a single row (:issue:`35462`)
 - Fixed regression in :meth:`DataFrame.reset_index` would raise a ``ValueError`` on empty :class:`DataFrame` with a :class:`MultiIndex` with a ``datetime64`` dtype level (:issue:`35606`, :issue:`35657`)
-- Fixed regression where :func:`pandas.merge_asof` would raise a ``UnboundLocalError`` when ``left_index`` , ``right_index`` and ``tolerance`` were set (:issue:`35558`)
+- Fixed regression where :func:`pandas.merge_asof` would raise a ``UnboundLocalError`` when ``left_index``, ``right_index`` and ``tolerance`` were set (:issue:`35558`)
 - Fixed regression in ``.groupby(..).rolling(..)`` where a custom ``BaseIndexer`` would be ignored (:issue:`35557`)
 - Fixed regression in :meth:`DataFrame.replace` and :meth:`Series.replace` where compiled regular expressions would be ignored during replacement (:issue:`35680`)
 - Fixed regression in :meth:`~pandas.core.groupby.DataFrameGroupBy.aggregate` where a list of functions would produce the wrong results if at least one of the functions did not aggregate (:issue:`35490`)
@@ -40,11 +40,11 @@ Fixed regressions
 Bug fixes
 ~~~~~~~~~
 
-- Bug in :class:`~pandas.io.formats.style.Styler` whereby `cell_ids` argument had no effect due to other recent changes (:issue:`35588`) (:issue:`35663`)
+- Bug in :class:`~pandas.io.formats.style.Styler` whereby ``cell_ids`` argument had no effect due to other recent changes (:issue:`35588`) (:issue:`35663`)
 - Bug in :func:`pandas.testing.assert_series_equal` and :func:`pandas.testing.assert_frame_equal` where extension dtypes were not ignored when ``check_dtypes`` was set to ``False`` (:issue:`35715`)
-- Bug in :meth:`to_timedelta` fails when arg is a :class:`Series` with `Int64` dtype containing null values (:issue:`35574`)
+- Bug in :meth:`to_timedelta` fails when ``arg`` is a :class:`Series` with ``Int64`` dtype containing null values (:issue:`35574`)
 - Bug in ``.groupby(..).rolling(..)`` where passing ``closed`` with column selection would raise a ``ValueError`` (:issue:`35549`)
-- Bug in :class:`DataFrame` constructor failing to raise ``ValueError`` in some cases when data and index have mismatched lengths (:issue:`33437`)
+- Bug in :class:`DataFrame` constructor failing to raise ``ValueError`` in some cases when ``data`` and ``index`` have mismatched lengths (:issue:`33437`)
 
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