[Doc] Fix tox command option to run smoke tests

This commit fixes the tox command option to run the smoke tests. The
original arguments fail with the error[1], and `-efull` and
`tempest.scenario.test_network_basic_ops` are not for the smoke tests.

[1]
 $ tox -efull tempest.scenario.test_network_basic_ops
 ...
 tempest run: error: unrecognized arguments: tempest.scenario.test_network_basic_ops

Change-Id: I9c3dd9fb4f64bf856c5cab88a2aeaae355c84a65
1 file changed