docs: change directory notation

Author: kenjis

user_guide_src/source/concepts/mvc.rst

@@ -28,7 +28,7 @@ the data storage.
 
 At their most basic, controllers and models are simply classes that have a specific job. They are not the only class
 types that you can use, obviously, but they make up the core of how this framework is designed to be used. They even
-have designated directories in the **/app** directory for their storage, though you're free to store them
+have designated directories in the **app** directory for their storage, though you're free to store them
 wherever you desire, as long as they are properly namespaced. We will discuss that in more detail below.
 
 Let's take a closer look at each of these three main components.

user_guide_src/source/concepts/structure.rst

@@ -12,8 +12,8 @@ can change to meet the needs of your application.
 Default Directories
 *******************
 
-A fresh install has five directories: ``/app``, ``/public``,
-``/writable``, ``/tests`` and ``/system`` or ``/vendor``.
+A fresh install has five directories: ``app/``, ``public/``,
+``writable/``, ``tests/`` and ``vendor/`` or ``system/``.
 Each of these directories has a very specific part to play.
 
 app
@@ -24,17 +24,17 @@ structure that works well for many applications. The following folders make up t
 
 .. code-block:: none
 
-    /app
-        /Config         Stores the configuration files
-        /Controllers    Controllers determine the program flow
-        /Database       Stores the database migrations and seeds files
-        /Filters        Stores filter classes that can run before and after controller
-        /Helpers        Helpers store collections of standalone functions
-        /Language       Multiple language support reads the language strings from here
-        /Libraries      Useful classes that don't fit in another category
-        /Models         Models work with the database to represent the business entities.
-        /ThirdParty     ThirdParty libraries that can be used in application
-        /Views          Views make up the HTML that is displayed to the client.
+    app/
+        Config/         Stores the configuration files
+        Controllers/    Controllers determine the program flow
+        Database/       Stores the database migrations and seeds files
+        Filters/        Stores filter classes that can run before and after controller
+        Helpers/        Helpers store collections of standalone functions
+        Language/       Multiple language support reads the language strings from here
+        Libraries/      Useful classes that don't fit in another category
+        Models/         Models work with the database to represent the business entities
+        ThirdParty/     ThirdParty libraries that can be used in application
+        Views/          Views make up the HTML that is displayed to the client
 
 Because the ``app`` directory is already namespaced, you should feel free to modify the structure
 of this directory to suit your application's needs. For example, you might decide to start using the Repository