Add documentation for minimap_draw and minimap_width

(cherry picked from commit df8f0e62156d5269953521aedb9297b079e3474d)

doc/classes/TextEdit.xml

@@ -442,8 +442,10 @@
 			If [code]true[/code], the line containing the cursor is highlighted.
 		</member>
 		<member name="minimap_draw" type="bool" setter="draw_minimap" getter="is_drawing_minimap" default="false">
+			If [code]true[/code], a minimap is shown, providing an outline of your source code.
 		</member>
 		<member name="minimap_width" type="int" setter="set_minimap_width" getter="get_minimap_width" default="80">
+			The width, in pixels, of the minimap.
 		</member>
 		<member name="mouse_default_cursor_shape" type="int" setter="set_default_cursor_shape" getter="get_default_cursor_shape" override="true" enum="Control.CursorShape" default="1" />
 		<member name="override_selected_font_color" type="bool" setter="set_override_selected_font_color" getter="is_overriding_selected_font_color" default="false">