fix: improve OpenTelemetry Setup in a Nodejs Application article (#918)

data/opentelemetry/nodejs.mdx

@@ -72,10 +72,10 @@ node -v
 
 Steps to get the app set up and running:
 
-1. **Make a directory and install express**<br></br>
-   Make a directory for your sample app on your machine. Then open up the terminal, navigate to the directory path and install express with the following command:
+1. **Make a directory and install express and cors**<br></br>
+   Make a directory for your sample app on your machine. Then open up the terminal, navigate to the directory path and install express and cors with the following command:
    ```
-   npm i express
+   npm i express cors
    ```
 
 2. **Create index.js**<br></br>