docs: fix server lookup instructions in publishing guide (#411)

The publishing guide incorrectly suggested users could verify their
server by directly accessing `/servers/{server-name}` or
`/v0/servers/{server-name}`, but the API only supports:

1. **Search by name**: `GET /v0/servers?search={server-name}`
2. **Get by UUID**: `GET /v0/servers/{uuid}`

This PR updates the documentation to show the correct verification
method using the search endpoint.

Fixes #410

docs/guides/consuming/use-rest-api.md

@@ -9,7 +9,7 @@ Integration patterns and best practices for building applications that consume M
 **Authentication**: Not required for read-only access
 
 - **`GET /v0/servers`** - List all servers with pagination
-- **`GET /v0/servers/{id}`** - Get full server details including packages and configuration
+- **`GET /v0/servers/{id}`** - Get server details by UUID
 
 See the [interactive API documentation](https://registry.modelcontextprotocol.io/docs) for complete request/response schemas.