Fix resource list change notification name format

Corrected `resources/notifications/list_changed` to
`notifications/resources/list_changed` on line 208 to follow standard
MCP notification naming pattern (`notifications/{category}/{event}`).

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Co-Authored-By: Claude <[email protected]>

Author: jonathanhefner

specification/draft/apps.mdx

@@ -219,7 +219,7 @@ Example:
 - Resource MUST exist on the server
 - Host MUST use `resources/read` to fetch the referenced resource URI.
 - Host MAY prefetch and cache UI resource content for performance optimization
-- Since UI resources are primarily discovered through tool metadata, Servers MAY omit UI-only resources from `resources/list` and `resources/notifications/list_changed`
+- Since UI resources are primarily discovered through tool metadata, Servers MAY omit UI-only resources from `resources/list` and `notifications/resources/list_changed`
 
 #### Benefits: