Update the remaining docs

docs/source/tech_locations.rst

@@ -15,10 +15,9 @@ file locations are described in this chapter.
 Configuration
 =============
 
-The general configuration of novelWriter, including everything that is in :guilabel:`Preferences`,
-is saved in one central configuration file. The location of this file depends on your operating
-system. The system paths are provided by the Qt QStandardPaths_ class and its ``ConfigLocation``
-value.
+The general configuration of novelWriter, including everything that is in **Preferences**, is saved
+in one central configuration file. The location of this file depends on your operating system. The
+system paths are provided by the Qt QStandardPaths_ class and its ``ConfigLocation`` value.
 
 The standard paths are:
 
@@ -40,9 +39,8 @@ Application Data
 ================
 
 novelWriter also stores a bit of data that is generated by the user's actions. This includes the
-list of recent projects form the :guilabel:`Open Project` dialog. Custom themes should also be
-saved here. The system paths are provided by the Qt QStandardPaths_ class and its
-``AppDataLocation`` value.
+list of recent projects form the **Welcome** dialog. Custom themes should also be saved here. The
+system paths are provided by the Qt QStandardPaths_ class and its ``AppDataLocation`` value.
 
 The standard paths are:
 
@@ -56,3 +54,12 @@ user's username on Windows.
 .. note::
    These are the standard operating system defined locations. If your system has been set up in a
    different way, these locations may also be different.
+
+The Application Data location also holds several folders:
+
+``cache``
+   This folder is used to save the preview data for the **Manuscript Build** tool.
+
+``icons``, ``syntax`` and ``themes``
+   These folders are empty by default, but this is where the user can store custom theme files.
+   See :ref:`a_custom` for more details.