Update Cross Org Billing Public Requirements

The page with requirements for cross org billing (https://docs.atlas.mongodb.com/billing/#configure-a-paying-organization) should be updated to the list below for the "Prerequisites and Limitations" section:

• The user doing the linking must have Organization Billing Admin or Org Owner privileges for both orgs.
• Both paying and linked orgs must be on the same subscription plan (i.e. Atlas Pro, Atlas Enterprise)
• Both paying and linked orgs must have the same minimums, uplifts, and SLA for their subscription plan
• The paying org and linked org cannot have overlapping monthly commitment deals
• The paying organization cannot already be a linked organization
• A paying organization must have an Atlas subscription
• A paying organization cannot link more than 100 other organizations.