[Makefile.tests] Small change in comment
[Makefile.tests] Small change in comment

mit-carbon/Graphite,8l/Graphite,mit-carbon/Graphite,8l/Graphite,mit-carbon/Graphite,8l/Graphite,fhijaz/Graphite,victorisildur/Graphite,mit-carbon/Graphite,nkawahara/Graphite,nkawahara/Graphite,victorisildur/Graphite,victorisildur/Graphite,fhijaz/Graphite,fhijaz/Graphite,nkawahara/Graphite,victorisildur/Graphite,8l/Graphite,fhijaz/Graphite,nkawahara/Graphite