Apply suggestion from @Copilot

Co-authored-by: Copilot <[email protected]>

Author: clydebarrow

components/mapping.rst

@@ -80,7 +80,7 @@ A more complex example follows:
       - id: blue
         hex: 0000FF
       - id: magenta
-        hex: FFFF00
+        hex: FF00FF
 
     font:
       - file: gfonts://Roboto