Update various Qt 5 references and links

docs/source/index.rst

@@ -20,7 +20,7 @@ The project storage is suitable for version control software, and also well suit
 synchronisation tools. All text is saved as plain text files, and your project data as standard
 data formats in XML and JSON. See :ref:`a_storage` for more details.
 
-Any operating system that has Python 3 and the Qt 5 libraries should be able to run novelWriter.
+Any operating system that has Python 3 and the Qt 6 libraries should be able to run novelWriter.
 It runs fine on Linux, Windows and MacOS, and users have tested it on other platforms as well.
 See :ref:`a_started` for more details.
 

docs/source/more_customise.rst

@@ -144,7 +144,7 @@ In the Main section you must at least define the ``name`` and ``icontheme`` sett
 setting must match the icon theme's folder name.
 
 The Palette values correspond to the Qt enum values for ``QPalette::ColorRole``, see the
-`Qt documentation <https://doc.qt.io/qt-5.15/qpalette.html#ColorRole-enum>`_ for more details. The
+`Qt documentation <https://doc.qt.io/qt-6/qpalette.html#ColorRole-enum>`_ for more details. The
 colour values are RGB numbers on the format ``r, g, b`` where each is an integer from ``0`` to
 ``255``. Omitted values are not loaded and will use default values. If the ``helptext`` colour is
 not defined, it is computed as a colour between the ``window`` and ``windowtext`` colour.

docs/source/tech_locations.rst

@@ -4,7 +4,7 @@
 File Locations
 **************
 
-.. _QStandardPaths: https://doc.qt.io/qt-5/qstandardpaths.html
+.. _QStandardPaths: https://doc.qt.io/qt-6/qstandardpaths.html
 
 novelWriter will create a few files on your system outside of the application folder itself. These
 file locations are described in this chapter.

docs/source/usage_writing.rst

@@ -136,12 +136,9 @@ document when reaching the end. There is also a switch that will try to match th
 when the replacement is made. That is, it will try to keep the word upper, lower, or capitalised to
 match the word being replaced.
 
-The regular expression search is somewhat dependant on which version of Qt your system has. If you
-have Qt 5.13 or higher, there is better support for Unicode symbols in the search.
-
 .. seealso::
    For more information on the capabilities of the Regular Expression option, see the Qt
-   documentation for the `QRegularExpression <https://doc.qt.io/qt-5/qregularexpression.html>`_
+   documentation for the `QRegularExpression <https://doc.qt.io/qt-6/qregularexpression.html>`_
    class.