ENH: minor fixes.

moringa.py

@@ -42,7 +42,7 @@ def main(args):
     segmt.add_argument("--n_proc", type=int, help="Number of cores to use.")
     segmt.add_argument("--mem_limit", type=int, help="Memory limit in MB.")
     segmt.add_argument("--keep_graph", help="Keep the graph files (.bin) after segmentation.", action='store_true')
-    segmt.add_argument("--force_parallel", help="Force the parallelization of the process even if the full graph fits in memory.", action='store_true')
+    segmt.add_argument("--force_parallel", help="Force the spot6/7 preprocess one-liner parallelization of the process even if the full graph fits in memory.", action='store_true')
 
     vhrprep = subpar.add_parser("preprocess_spot67", help="Perform baseline pre-processing of a SPOT6/7 scene in raster sensor.",
                                 formatter_class=argparse.ArgumentDefaultsHelpFormatter)