Update enterprise plans documentation to clarify reserved capacity on deployment cluster (#368)

Author: yuhuangou

fern/enterprise/plans.mdx

@@ -10,7 +10,7 @@ If you're building a production application on Vapi, we can help you every step
 #### Enterprise Plans include:
 
 - Unlimited concurrency and higher rate limits
-- Reserved capacity on our dedicated Enterprise Cluster
+- Reserved capacity on our weekly deployment cluster
 - Hands-on 24/7 support with dedicated solutions engineer
 - Shared Slack channel with our team
 - Regular check-in calls with our team