Fix variable typo

The script would not run because of a typo with "languageEndpoint"

Author: SimonSchroffner

articles/cognitive-services/language-service/sentiment-opinion-mining/includes/quickstarts/nodejs-sdk.md

@@ -68,7 +68,7 @@ const languageKey = process.env.LANGUAGE_KEY;
 const languageEndpoint = process.env.LANGUAGE_ENDPOINT;
 
 // Authenticate the client with your key and endpoint.
-const textAnalyticsClient = new TextAnalyticsClient(LanguageEndpoint,  new AzureKeyCredential(languageKey));
+const textAnalyticsClient = new TextAnalyticsClient(languageEndpoint,  new AzureKeyCredential(languageKey));
 
 // Example method for detecting sentiment and opinions in text.
 async function sentimentAnalysisWithOpinionMining(client){
@@ -162,4 +162,4 @@ sentimentAnalysisWithOpinionMining(textAnalyticsClient);
 * [Sentiment analysis and opinion mining language support](../../language-support.md)
 * [How to call the API](../../how-to/call-api.md)  
 * [Reference documentation](/javascript/api/overview/azure/ai-text-analytics-readme?preserve-view=true&view=azure-node-latest)
-* [Additional samples](https://github.com/Azure/azure-sdk-for-js/tree/main/sdk/textanalytics/ai-text-analytics/samples)
+* [Additional samples](https://github.com/Azure/azure-sdk-for-js/tree/main/sdk/textanalytics/ai-text-analytics/samples)