Update node-server-rendering.md

docs/additional-reading/node-server-rendering.md

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-# Node.js for Server Rendering (rather execjs)
+# Node.js for Server Rendering
 
 Node.js can be used as the backend for server-side rendering instead of [execJS](https://github.com/rails/execjs). Before you try this, consider the tradeoff of extra complexity with your deployments versus *potential* performance gains. We've found that using ExecJS with [mini_racer](https://github.com/discourse/mini_racer) to be "fast enough" so far. That being said, we've heard of other large websites using Node.js for better server rendering performance.