Fix the --help

[genericdata]

For upstream_fasta, downstream_fasta ref_fasta running --help will pring the option and explanation on the following line unlike the others. Requesting all to be uniform.

  --chrom CHROM         Chromosome name (String)
  --in_fasta IN_FASTA   Path(s) to new sequence(s) to be inserted into reference genome in fasta format
  --in_gff IN_GFF       Path(s) to GFF file(s) describing new fasta sequence(s) to be inserted
  --upstream_fasta UPSTREAM_FASTA
                        Path(s) to Fasta file(s) with upstream sequence. Either position, or upstream AND downstream
                        sequence must be provided.
  --downstream_fasta DOWNSTREAM_FASTA
                        Path(s) to Fasta file(s) with downstream sequence. Either position, or upstream AND downstream
                        sequence must be provided.
  --position POSITION   Comma-separated positions at which to insert new sequence. Note: Position is 0-based, no space
                        between each comma. Either position, or upstream AND downstream sequence must be provided.
  --ref_fasta REF_FASTA
                        Path to reference fasta file
  --ref_gff REF_GFF     Path to reference gff file