SCIPROD-2031 [GENOMOD] pretty print example filer JSON

[mstevuliak-dx]

removing # from --json-help text:

# Example using location:
# {
#   "sample_id": ["s1", "s2"],
#   "location": [
#     {
#       "chromosome": "1",
#       "starting_position": "10000"
#     },
#     {
#       "chromosome": "X",
#       "starting_position": "500"
#     }
#   ],
#   "genotype_type": ["ref", "het-ref", "hom", "het-alt", "half", "no-call"]
# }
#
# Example using allele_id:
{
  "sample_id": ["s1", "s2"],
  "allele_id": ["1_1000_A_T","2_1000_G_C"],
  "genotype_type": ["het-ref", "hom", "het-alt", "half"]
}