Enhancing the "n_robust_runs" description suggested by D. Handwerkerd

Co-authored-by: Dan Handwerker <7406227+handwerkerd@users.noreply.github.com>

tedana/workflows/tedana.py

@@ -204,7 +204,7 @@ def _get_parser():
         dest="n_robust_runs",
         type=int,
         help=(
-            "The number of times robustica will run."
+            "The number of times robustica will run. "
             "This is only effective when ica_method is "
             "set to robustica."
         ),