Added comment to ggLevel variable for QCEW

src/FACT_jobs.jl

@@ -70,6 +70,7 @@ function us_qcew(conn::MySQL.Connection, selection::Dict)
     # getting valuable info from dictionary
     year = selection["year"]
     geo_id = selection["geo_id"]
+    # the agg level refers to the number of NAICS digits and goes from 2 to 6
     agg_level = selection["agg_level"]
     # object to be returned
     dftemp = DataFrame()