added examples of color degradation

Author: freezy-sk

console/coloring.rst

@@ -51,6 +51,7 @@ Any hex color is supported for foreground and background colors. Besides that, t
 .. note::
 
     If the terminal doesn't support true colors, the nearest named color is used.
+    E.g. ``#c0392b`` is degraded to ``red`` or ``#f1c40f`` is degraded to ``yellow``.
 
 And available options are: ``bold``, ``underscore``, ``blink``, ``reverse``
 (enables the "reverse video" mode where the background and foreground colors