[TASK] Mention Internal Notes in help section (#215)

* [TASK] Changes after code review

releases: main, 13.4

* [TASK] Changes after code review

releases: main, 13.4

* Apply suggestions from code review

* Update Documentation/HelpInside/InternalNotes/Index.rst

Co-authored-by: Stefan Frömken <froemken@gmail.com>

---------

Co-authored-by: Stefan Frömken <froemken@gmail.com>

Author: linawolf

Documentation/HelpInside/Index.rst

@@ -14,10 +14,8 @@ help guide you when using the TYPO3.
     outdated and not maintained. Refer to the
     :ref:`typo3-online-documentation` instead.
 
-Topics
-======
-
 ..  toctree::
+    :caption: Topics
     :titlesonly:
     :glob:
 

Documentation/HelpInside/InternalNotes/Index.rst

@@ -0,0 +1,40 @@
+:navigation-title: Internal Notes
+
+..  include:: /Includes.rst.txt
+..  _internal-notes:
+
+===================================
+Internal notes in the TYPO3 backend
+===================================
+
+..  note::
+    These are only available if :composer:`typo3/cms-sys-note` is installed
+    and your administrator granted you the necessary user rights.
+
+Internal notes, also called system notes, are small text notes that are
+displayed in the `Page module <https://docs.typo3.org/permalink/t3editors:content-creating>`_
+and `List module <https://docs.typo3.org/permalink/t3editors:using-the-list-module-effectively>`_.
+
+You can use them to write notes to yourself or other editors. Administrators
+can use them to write notes to you as well.
+
+They look like this:
+
+..  figure:: /Images/ManualScreenshots/Page/PageWithSysNote.png
+    :alt: Screenshot of a TODO note on the top of the "Page" backend module
+
+    If you have sufficient permissions you can also edit or delete the note.
+
+    The following image shows a detailed view of the TYPO3 backend toolbar, specifically in
+    the context of the "Page" or "List" module. On the right side of the toolbar are a number
+    of buttons, each providing different functionality. The button highlighted in this screenshot
+    is which allows the user to create a new internal note.
+
+..  figure:: /Images/ManualScreenshots/Page/sys_note_create.png
+    :alt: Screenshot demonstrating the location of the "Create internal note" button in the module header of the Page module
+
+    The button to create a system note is located on the top right of the "Page" and "List" modules
+
+..  seealso::
+    For a detailed description on how to use the internal notes see
+    `System notes manual, for Editors <https://docs.typo3.org/permalink/typo3/cms-sys-note:for-editors>`_.