update references to shell sample that was moved by
https://gerrit.zephyrproject.org/r/#/c/12442/
Change-Id: I61b527c9077b05b67fc9c43f2ecff50dc92dae9c
Signed-off-by: David B. Kinder <david.b.kinder@intel.com>
This includes:
* Moving the Nordic nRF5x Segger J-Link page (temporarily placed inside
one of the board folders)
* Moving the nrf52_pca10040 doc
* Moving the nrf51_pca10028 doc
* Moving the nrf52840_pca10056 doc
Change-Id: I051eb51cee8166ae6472eb696ffeb0625a0424c7
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>