modify help menu

fatools

@@ -56,8 +56,8 @@ def get_options(command):
         -G N split the sequences as non-gap framments, N is the number of consecutive Ns, default 1
          Use -G with -t to  print gap positions only.
         -n N plit the input sequences into chunks, each containing N fasta entries (the last chunk may be less). 
-        -N split the input sequences into N chunks, each containing equal number of entries (last one may be smaller).
-        -M split the input sequences into chunks at ~N MB (million bp) in size (last chunk may be smaller).
+        -N N split the input sequences into N chunks, each containing equal number of entries (last one may be smaller).
+        -M N split the input sequences into chunks at ~N MB (million bp) in size (last chunk may be smaller).
         -o "prefix" for output files (serial numbers added to prefix; required).\n
         """)
     elif command == 'extract':