Update install-serverless-azure-monitoring.mdx

Corrected command to add NuGet package

src/content/docs/serverless-function-monitoring/azure-function-monitoring/install-serverless-azure-monitoring.mdx

@@ -37,7 +37,7 @@ Based on your requirement, select one of the following options to instrument you
     1. Add the `NewRelic.Agent` NuGet package to your application project.
 
        * In Visual Studio code editor, use  NuGet Package Manager to search for and add the latest version of `NewRelic.Agent` to your application.
-       * If you're using other development environments, you can add the package with `dotnet add packages NewRelic.Agent`.
+       * If you're using other development environments, you can add the package with `dotnet add package NewRelic.Agent`.
     2. Use your preferred publishing mechanism to deploy your updated application to Azure. This includes the New Relic agent, which is installed to the `/home/site/www/newrelic` folder.
 
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