The ADC driver in this PR has been tested working on these nucleo
boards, so ADC support is added to the boards doc.
Signed-off-by: Song Qiang <songqiang1304521@gmail.com>
Be consistent in how board docs are named and move all to index.rst.
This will make the URL to the board documentation predictable and easier
to remember.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>