Clarifying discontinuation notice for cloud routers (#8842)

EOL of serverless plans remains Feb. 1, but a grace period until Feb. 15 has been implemented. This change clarifies the language of the discontinuation notice.

Author: pragl

docs/shared/cloud-router-discontinuation-notice.mdx

@@ -1,6 +1,6 @@
 <Caution>
 
-Apollo is discontinuing Serverless and Dedicated plans, which use cloud routers. Cloud routers will no longer be available after February 1, 2026 (Serverless) and March 15, 2026 (Dedicated).
+Apollo is discontinuing Serverless and Dedicated plans, which use cloud routers. Serverless plans end on February 1, 2026, and serverless cloud routers are not available after February 15, 2026. Dedicated plans end on March 15, 2026, and dedicated cloud routers are not available after March 15, 2026.
 
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