boards: 96b_carbon_nrf51: move note below overview

The first note should be under overview and not at the same level as the
title.

Signed-off-by: Anas Nashif <[email protected]>

Author: nashif

boards/arm/96b_carbon_nrf51/doc/index.rst

@@ -3,18 +3,19 @@
 96Boards Carbon nRF51
 #####################
 
+Overview
+********
+
+This is the secondary nRF51822 chip on the 96Boards Carbon and provides
+Bluetooth functionality to the main STM32F401RET chip via SPI.
+
 .. note::
 
    If you're looking to reprogram the main STMicro part, see
    :ref:`96b_carbon_board`. Users should not use this configuration
    unless they want to reprogram the secondary chip which provides
    Bluetooth connectivity.
 
-Overview
-********
-
-This is the secondary nRF51822 chip on the 96Boards Carbon and provides
-Bluetooth functionality to the main STM32F401RET chip via SPI.
 
 Hardware
 ********