feat!: fumadocs example, mark clientReferenceDedup experimental #1772

Job	Run time
Vitest	5m 45s
Check	30s
E2E (cloudflare-dev)	1m 0s
create-next-app (windows-latest)	2m 8s
E2E (app-router)	1m 39s
E2E (cloudflare-workers)	57s
E2E (pages-router-prod)	51s
create-next-app (ubuntu-latest)	57s
E2E (cloudflare-pages-router-dev)	41s
E2E (cloudflare-pages-router)	1m 20s
E2E (pages-router)	15s
	16m 3s

Provide feedback