Fix examples

Author: clydebarrow

components/mapping.rst

@@ -48,7 +48,7 @@ Using a mapping
 
 A mapping defined in this component can be used in lambdas in other components. The mapping can be accessed using
 the ``id`` function, and the value can be looked up using the ``[]`` operator as per the above example, or the ``get`` function.
-A map may be updated at run time using a lambda call, e.g. ``map["key"] = value`` or ``map.set("key", value)``.
+A map may be updated at run time using a lambda call, e.g. ``map.set("key", value)``.
 
 Maps are stored in RAM, but will use PSRAM if available.
 
@@ -79,8 +79,6 @@ A more complex example follows:
         hex: 00FF00
       - id: blue
         hex: 0000FF
-      - id: magenta
-        hex: FF00FF
 
     font:
       - file: gfonts://Roboto
@@ -92,14 +90,14 @@ A more complex example follows:
       - platform: ...
         # update the display drawing random text in random colors
         lambda: |-
-          auto color = color_map.get(random_uint32() % 4]); # Uses get() to index the color_map
+          auto color = color_map.get(random_uint32() % 3]); # Uses get() to index the color_map
           it.printf(100, 100, id(roboto20), color, id(string_map)[random_uint32() % 3].c_str(), Color(0));
 
 
     on_...:
       then:
         - lambda: |-
-              id(color_map)[2] = Color::random_color();
+              id(color_map).set(2, Color::random_color());
 
 See Also
 --------