beginner: more doc fixes

Change-Id: Icfd48c0c81470866d6008e8637a1f204683bde03
Reviewed-on: http://gerrit.aldebaran.lan/26763
Reviewed-by: dmerejkowsky <dmerejkowsky@aldebaran-robotics.com>
Tested-by: dmerejkowsky <dmerejkowsky@aldebaran-robotics.com>
fix typo

Change-Id: I54e4bbef1ae0f4ed768f5608b5567b3ab3d0285f
was: qibuild, should be: pip
Reviewed-on: http://gerrit.aldebaran.lan/26764
Tested-by: gerrit
Reviewed-by: dmerejkowsky <dmerejkowsky@aldebaran-robotics.com>
Tested-by: dmerejkowsky <dmerejkowsky@aldebaran-robotics.com>