Proofreading fixes for GUI style doc (#1941)

* Improve phrasing in GUI style intro

doc/programming_guide/gui/style.rst

@@ -4,37 +4,42 @@ GUI Style
 ---------
 
 
-With arcade 3.0 a whole new styling mechanism for GUI widgets was introduced.
-The new styling allows more type safe and clear styling while staying flexible.
+Arcade 3.0 added a new approach for styling GUI widgets. It is flexible, yet also
+improves clarity and type safety.
 
-Following widgets support styling:
+
+.. _gui_style_which_widgets:
+
+Which Widgets Can I Style?
+==========================
+
+The following widgets support styling:
 
 - :py:class:`~arcade.gui.UITextureButton`
 - :py:class:`~arcade.gui.UIFlatButton`
 - :py:class:`~arcade.gui.UISlider`
 
-For an advanced description about the style system read the 'Advanced' section.
 
 Basic Usage
 ===========
 
-This section covers how to use the existing stylable widgets.
+This section will style a :py:class:`~arcade.gui.UIFlatButton` as an example. You
+can use the same general approach for other stylable widgets, but you may want to
+check their documentation for additional values they may support.
 
-    In the following examples we will use the :py:class:`~arcade.gui.UIFlatButton` as the stylable widget,
-    you can do the same with any stylable widget listed above.
+To create your own widgets, please see the 'Advanced' section.
 
 
 Quickstart
-```````````
+``````````
 
 The following example shows how to adjust the style.
 
-
 .. code-block::
 
-    # create an own style
+    # Styles are dictionaries of UIStyle objects
     new_style = {
-        # provide a style for each widget state
+        # You should provide a style for each widget state
         "normal": UIFlatButton.UIStyle(), # use default values for `normal` state
         "hover": UIFlatButton.UIStyle(
             font_color=arcade.color.BLACK,
@@ -50,17 +55,20 @@ The following example shows how to adjust the style.
         )
     }
 
+    # Pass the style dictionary when creating a UI element
     UIFlatButton(style=new_style)
 
 
 Default style
-``````````````
+`````````````
 
-Stylable widgets have a property which holds the default style for
-the type of widget. For the :py:class:`~arcade.gui.UIFlatButton` this is `UIFlatButton.DEFAULT_STYLE`.
+Each stylable widget class has a ``DEFAULT_STYLE`` class attribute to hold the
+default style for that type of widget. For example, on
+:py:class:`~arcade.gui.UIFlatButton`, you can access this attribute via
+``UIFlatButton.DEFAULT_STYLE``.
 
-This default style will be used if no other style is provided within the constructor.
-The default style looks like this:
+This default style will be used if no other style is provided when creating an instance
+of the class.
 
 .. code-block::
 
@@ -95,7 +103,7 @@ The default style looks like this:
         }
 
 Style attributes
-`````````````````
+````````````````
 
 A UIStyle is a typed description of available style options.
 For the UIFlatButton the supported attributes are:
@@ -116,7 +124,7 @@ The style attribute is a dictionary, which maps a state like 'normal, 'hover' et
 to an instance of UIFlatButton.UIStyle.
 
 Wellknown states
-`````````````````
+````````````````
 
 ======== ======================================================
 Name     Description
@@ -192,6 +200,3 @@ Your own stylable widget
             # render
             if color: # support for not setting a color at all
                 surface.clear(bg_color)
-
-
-