Clarified a message print statement.

gprMax/gprMax.py

@@ -389,7 +389,7 @@ def run_model(args, modelrun, numbermodelruns, inputfile, inputdirectory):
         tsolveend = perf_counter()
         print('\n\nSolving took [HH:MM:SS]:'.format(datetime.timedelta(seconds=int(tsolveend - tsolvestart))))
         if sys.platform != 'win32':
-            print('Peak memory (approx) required: {}'.format(human_size(resource.getrusage(resource.RUSAGE_SELF).ru_maxrss, False)))
+            print('Peak memory (approx) used: {}'.format(human_size(resource.getrusage(resource.RUSAGE_SELF).ru_maxrss, False)))