Clarify that some features are not in the simulator

Author: PeterJCLaw

programming/sr/ruggeduinos/custom_firmware.md

@@ -6,6 +6,10 @@ title: Ruggeduino custom firmware
 Custom firmware
 ===============
 
+<div class="info">
+This documentation refers to a feature which is only available on the physical robot kits.
+</div>
+
 The Ruggeduino that came as part of your kit was shipped with a firmware that provides the functionality outlined in the [Ruggeduino](/docs/programming/sr/ruggeduinos) page.
 You may wish to extend the functionality of this firmware, or completely replace it.
 The `sr.robot` library provides support for three Ruggeduino firmware scenarios:

programming/sr/servos/index.md

@@ -6,6 +6,10 @@ title: Servos
 Servos
 ======
 
+<div class="info">
+This documentation refers to a feature which is only available on the physical robot kits.
+</div>
+
 The `servos` object is used to control a collection of Servo Boards.
 Similar to `motors` and `ruggeduinos`, `servos` can be used like a list.
 To do something with the **first Servo Board**, you would use:

programming/sr/vision/index.md

@@ -6,6 +6,10 @@ title: Vision
 Vision
 ======
 
+<div class="info">
+This documentation refers to a feature which is only available on the physical robot kits.
+</div>
+
 The `sr.robot` library contains support for detecting libkoki markers with the provided webcam.
 Markers are attached to various items in the Student Robotics arena.
 Each marker encodes a number in a machine-readable way, which means that robots can identify these objects.