Use correct name in tests template documentation.
Use correct name in tests template documentation.

cellml/libcellml,hsorby/libcellml,hsorby/libcellml,libcellml/buildbot-testing,MichaelClerx/libcellml,nickerso/libcellml,libcellml/buildbot-testing,hsorby/libcellml,MichaelClerx/libcellml,nickerso/libcellml,nickerso/libcellml,hsorby/libcellml,cellml/libcellml,nickerso/libcellml,cellml/libcellml,MichaelClerx/libcellml,cellml/libcellml