source.tcl minor doc corrections
source.tcl minor doc corrections

Change-Id: I382bca72e4dc9262676da34101969b39d5cf0caf
Signed-off-by: Michael Walsh <10404802c7de463f402c4a18638106ca1b12ef61@us.ibm.com>

openbmc/openbmc-test-automation,openbmc/openbmc-test-automation