Updated CHANGES for Sphinx 6.1.0

CHANGES

@@ -4,18 +4,62 @@ Release 6.1.0 (in development)
 Dependencies
 ------------
 
+* Adopted the `Ruff`_ code linter.
+
+  .. _Ruff: https://github.com/charliermarsh/ruff
+
 Incompatible changes
 --------------------
 
+* #10979: gettext: Removed support for pluralisation in ``get_translation``.
+  This was unused and complicated other changes to ``sphinx.locale``.
+
 Deprecated
 ----------
 
+* ``sphinx.util`` functions:
+
+   * Renamed ``sphinx.util.typing.stringify()``
+     to ``sphinx.util.typing.stringify_annotation()``
+   * Moved ``sphinx.util.xmlname_checker()``
+     to ``sphinx.builders.epub3._XML_NAME_PATTERN``
+
+   Moved to ``sphinx.util.display``:
+
+   * ``sphinx.util.status_iterator``
+   * ``sphinx.util.display_chunk``
+   * ``sphinx.util.SkipProgressMessage``
+   * ``sphinx.util.progress_message``
+
+   Moved to ``sphinx.util.http_date``:
+
+   * ``sphinx.util.epoch_to_rfc1123``
+   * ``sphinx.util.rfc1123_to_epoch``
+
+   Moved to ``sphinx.util.exceptions``:
+
+   * ``sphinx.util.save_traceback``
+   * ``sphinx.util.format_exception_cut_frames``
+
 Features added
 --------------
 
+* Cache doctrees in the build environment during the writing phase.
+* Make all writing phase tasks support parallel execution.
+* #11072: Use PEP 604 (``X | Y``) display conventions for ``typing.Optional``
+  and ``typing.Optional`` types within the Python domain and autodoc.
+* #10700: autodoc: Document ``typing.NewType()`` types as classes rather than
+  'data'.
+* Cache doctrees between the reading and writing phases.
+
 Bugs fixed
 ----------
 
+* #10962: HTML: Fix the multi-word key name lookup table.
+* Fixed support for Python 3.12 alpha 3 (changes in the ``enum`` module).
+* #11069: HTML Theme: Removed outdated "shortcut" link relation keyword.
+* #10952: Properly terminate parallel processes on programme interuption.
+* #10988: Speed up ``TocTree.resolve()`` through more efficient copying.
 * #6744: LaTeX: support for seealso directive should be via an environment
   to allow styling.
 * #11074: LaTeX: Can't change sphinxnote to use sphinxheavybox starting with