docs: Add missing newline to configuration.md (#244)

Author: slg95

doc/configuration.md

@@ -317,6 +317,7 @@ require("mcphub").setup({
 - `params.action` - Either "use_mcp_tool" or "access_mcp_resource"
 - `params.uri` - Resource URI (for resource access)
 - `params.is_auto_approved_in_server` - Boolean indicating if tool is configured for auto-approval in servers.json
+
 **Return values:**
 - `true` - Auto-approve the call
 - `false` - Show confirmation prompt