Update job-priority.md

docs.it4i/general/job-priority.md

@@ -2,7 +2,7 @@
 
 ## Job Priority
 
-The scheduler gives each job an priority and then uses this job priority to select which job(s) to run.
+The scheduler gives each job a priority and then uses this job priority to select which job(s) to run.
 
 Job priority is determined by these job properties (in order of importance):