Hiring by small businesses cooled off this past month, mirroring a similarly modest slowdown across the broader economy, according to a new report. Small employers added 84,000 workers in July, down from a two-year high of 126,000 new positions added the month before, according to payroll processing firm ADP. Initially, the company had reported that small businesses (fewer than 50 employees) had added 117,000 jobs in June.