Amended usage to reflect -h/-m changes

fix

@@ -46,7 +46,7 @@ Usage for each stage separately, including creation of training data:
       testing using existing hand classifictions.
     Every Melodic directory must contain hand_labels_noise.txt listing the artefact components, e.g.:  [1, 4, 99, ... 140].
 
-  fix -a <mel.ica/fix4melview_TRAIN_thr.txt>  [-m [-h <highpass>]]  [-A]
+  fix -a <mel.ica/fix4melview_TRAIN_thr.txt>  [-m] [-h <highpass>]  [-A]
     Apply cleanup, using artefacts listed in the .txt file, to the data inside the enclosing Feat/Melodic directory.
     -h -1          apply no highpass filtering.
     -h 0           apply linear detrending only.