Adding more details in Postman variables
- Explain what the postman variables are
- Show they look in the UI (postman)
- Differentiate  Postman export global vars
  from GitLab custom format.
- Show the CI yaml sample w/ Postman variables
- Indentation issue
- Link FUZZAPI_POSTMAN_COLLECTION_VARIABLES
  to the item 6 or the section

Adding mode details in Overrides
- Mention new capabilities (e.g. body-xml, body-json, ...)
  in 1st paragraph.
- XML override, example on how to change a element value
- XML override, example on how to change a attribute