doc: fix manifest example
doc: fix manifest example

Change-Id: Ib1a7e1ad0b83d2932dd844fbf92539338879f59a
Reviewed-on: http://gerrit.aldebaran.lan/59907
Tested-by: gerrit
Reviewed-by: sbarthelemy <9c154f64c36738f8e44d945c231ac417d15bd66e@aldebaran.com>

aldebaran/qibuild,aldebaran/qibuild,aldebaran/qibuild,aldebaran/qibuild