docs: fix PUT endpoint documentation - version parameter is required

The PUT /v0/servers/{server_id} endpoint requires the version query parameter
and no longer supports editing "latest" without specifying an exact version.

This aligns the documentation with the actual implementation where the version
parameter is marked as required in the EditServerInput struct.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: tadasant

docs/reference/api/official-registry-api.md

@@ -58,4 +58,4 @@ Example: `GET /v0/servers?search=filesystem&updated_since=2025-08-01T00:00:00Z&v
 #### Admin endpoints
 - GET `/metrics` - Prometheus metrics endpoint
 - GET `/v0/health` - Basic health check endpoint
-- PUT `/v0/servers/{server_id}?version=X.X.X` - Edit specific server version (or latest if version omitted)
+- PUT `/v0/servers/{server_id}?version=X.X.X` - Edit specific server version (version parameter required)