Fix typo in tempest configuration page
Fix typo in tempest configuration page

Removes an extra 'what' from the string.

Change-Id: I5c84ea627c84721ed333514ec5c3a62358ab7585
Closes-Bug: #1485843

masayukig/tempest,vedujoshi/tempest,rakeshmi/tempest,dkalashnik/tempest,cisco-openstack/tempest,pczerkas/tempest,bigswitch/tempest,bigswitch/tempest,Tesora/tesora-tempest,Juniper/tempest,Juniper/tempest,izadorozhna/tempest,tonyli71/tempest,LIS/lis-tempest,flyingfish007/tempest,cisco-openstack/tempest,pczerkas/tempest,LIS/lis-tempest,zsoltdudas/lis-tempest,izadorozhna/tempest,flyingfish007/tempest,masayukig/tempest,vedujoshi/tempest,xbezdick/tempest,openstack/tempest,dkalashnik/tempest,xbezdick/tempest,zsoltdudas/lis-tempest,rakeshmi/tempest,sebrandon1/tempest,openstack/tempest,tonyli71/tempest,sebrandon1/tempest,Tesora/tesora-tempest