Below are sample syllabi from some of the courses I've taught. The most recent examples were generated using Literature & Latte's Scrivener application. With it, you can create global elements (e.g., contact information, class policies, office hours), general elements (e.g., upper and lower level or studio and lecture grade scales), and course-specific elements (e.g., course descriptions, supply lists, calendars).
So, you can modify a policy in one place and have that propagate to all syllabi. Or you can update a rubric for upper level studio courses and have that change exclusively in the syllabi of the relevant courses. And you can update the course description or set the current term on a specific syllabus without impacting any others.