Under 'Criteria for passing a review'

removed a reference to an Issue with installation on Mac OS, which is now Closed - https://github.com/michaelmcandrew/civicrm-buildkit-docker/issues/15

Formatting and wording

JIRA is dead.

Actually I think we should put the 'other platforms' first & the more specific options at the end though

Moved Jira to "out of use" as it's now been archived.