[FAL-49] Drive-by fixes for a couple small inconsistencies

• Fixes a couple ticket refs in template for epic planning and sustainability updates.
  • Discovered in the context of epic planning and sustainability updates for Falcon.
• Updates Cell-Specific Rules page to explicitly mention Falcon's current limit for simultaneous vacations.
  • Discovered while reviewing STAR-3148 (ref).

Tickets

• FAL-49