Update 6.1 changelog with post rc1 changes (jupyter#5639)

* Update 6.1 changelog with post rc1 changes

Author: kevin-bates

docs/source/changelog.rst

@@ -42,7 +42,7 @@ Here is an enumeration of changes made since the last release and included in 6.
 - Added nl language (:ghpull:`5354`)
 - Add UNIX socket support to notebook server. (:ghpull:`4835`)
 - Update CodeMirror dependency (:ghpull:`5198`)
-- tree added download multiple files (:ghpull:`5351`)
+- Tree added download multiple files (:ghpull:`5351`)
 - Toolbar buttons tooltip: show help instead of label (:ghpull:`5107`)
 - Remove unnecessary import of requests_unixsocket (:ghpull:`5451`)
 - Add ability to cull terminals and track last activity (:ghpull:`5372`)
@@ -52,25 +52,25 @@ Here is an enumeration of changes made since the last release and included in 6.
 - Add cell attachments to markdown example (:ghpull:`5412`)
 - Add Japanese document (:ghpull:`5231`)
 - Migrate Move multiselection test to selenium (:ghpull:`5158`)
-- use cmdtrl-enter to run a cell (:ghpull:`5120`)
+- Use ``cmdtrl-enter`` to run a cell (:ghpull:`5120`)
 - Fix broken "Raw cell MIME type" dialog (:ghpull:`5385`)
 - Make a notebook writable after successful save-as (:ghpull:`5296`)
 - Add actual watch script (:ghpull:`4738`)
-- added `--autoreload` flag to `NotebookApp` (:ghpull:`4795`)
+- Added ``--autoreload`` flag to ``NotebookApp`` (:ghpull:`4795`)
 - Enable check_origin on gateway websocket communication (:ghpull:`5471`)
 - Restore detection of missing terminado package (:ghpull:`5465`)
-- Culling: ensure last_activity attr exists before use (:ghpull:`5355`)
+- Culling: ensure ``last_activity`` attr exists before use (:ghpull:`5355`)
 - Added functionality to allow filter kernels by Jupyter Enterprise Gat… (:ghpull:`5484`)
 - 'Play' icon for run-cell toolbar button (:ghpull:`2922`)
 - Bump minimum version of jQuery to 3.5.0 (:ghpull:`5491`)
-- remove old JS markdown tests, add a new one in selenium (:ghpull:`5497`)
-- add support for more RTL languages (:ghpull:`5036`)
+- Remove old JS markdown tests, add a new one in selenium (:ghpull:`5497`)
+- Add support for more RTL languages (:ghpull:`5036`)
 - Make markdown cells stay RTL in edit mode (:ghpull:`5037`)
 - Unforce RTL output display (:ghpull:`5039`)
 - Fixed multicursor backspacing (:ghpull:`4880`)
 - Implemented Split Cell for multicursor (:ghpull:`4824`)
 - Alignment issue [FIXED] (:ghpull:`3173`)
-- MathJax: Support for \gdef (:ghpull:`4407`)
+- MathJax: Support for ``\gdef`` (:ghpull:`4407`)
 - Another (Minor) Duplicate Code Reduction (:ghpull:`5316`)
 - Update readme regarding maintenance (:ghpull:`5500`)
 - Document contents chunks (:ghpull:`5508`)
@@ -81,29 +81,53 @@ Here is an enumeration of changes made since the last release and included in 6.
 - Fix for the terminal shutdown issue (:ghpull:`4180`)
 - Add japanese translation files (:ghpull:`4490`)
 - Workaround for socket permission errors on Cygwin (:ghpull:`4584`)
+- Implement optional markdown header and footer files (:ghpull:`4043`)
+- Remove double link when using ``custom_display_url`` (:ghpull:`5544`)
+- Respect ``cell.is_editable`` during find-and-replace (:ghpull:`5545`)
+- Fix exception causes all over the codebase (:ghpull:`5556`
+- Improve login shell heuristics (:ghpull:`5588`)
+- Added support for ``JUPYTER_TOKEN_FILE`` (:ghpull:`5587`)
+- Kill notebook itself when server cull idle kernel (:ghpull:`5593`)
+- Implement password hashing with bcrypt (:ghpull:`3793`)
+- Fix broken links (:ghpull:`5600`)
+- Russian internationalization support (:ghpull:`5571`)
+- Add a metadata tag to override notebook direction (ltr/rtl) (:ghpull:`5052`)
+- Paste two images from clipboard in markdown cell (:ghpull:`5598`)
+- Add keyboard shortcuts to menu dropdowns (:ghpull:`5525`)
+- Update codemirror to ``5.56.0+components1`` (:ghpull:`5637`)
 
 Thank you to all the contributors:
 
+- Aaron Myatt
+- Adam Blake
 - Afshin Taylor Darian
 - Aman Bansal
 - Ben Thayer
 - berendjan
 - Bruno P. Kinoshita
 - bzinberg
+- Christophe Cadilhac
 - Daiki Katsuragawa
+- David Lukes
+- Dmitriy Q
 - dmpe
 - dylanzjy
 - dSchurch
 - E\. M\. Bray
 - ErwinRussel
+- Felix Mönckemeyer
 - Grant Nestor
+- Jarrad Whitaker
 - Jesus Panales Castillo
 - Joshua Zeltser
 - Karthikeyan Singaravelan
 - Kenichi Ito
 - Kevin Bates
+- Koki Nishihara
 - Kris Wilson
 - Kyle Kelley
+- Laura Merlo
+- levinxo
 - Luciano Resende
 - Luis Cabezon Manchado
 - Madhusudhan Srinivasa
@@ -116,10 +140,15 @@ Thank you to all the contributors:
 - Niko Felger
 - Norah Abanumay
 - Onno Broekmans
+- PierreMB
 - pinarkavak
+- Ram Rachum
+- Reece Hart
+- Remi Rampin
 - Rohit Sanjay
 - Shane Canon
 - Simon Li
+- Steinar Sturlaugsson
 - Steven Silvester
 - taohan16
 - Thew Dhanat