Updated key

Trying to get all subscription keys in a standard format across all services.
<SERVICE>_SUBSCRIPTION_KEY

Author: wiazur

Search/BingAutoSuggest/src/main/java/com/microsoft/azure/cognitiveservices/search/autosuggest/samples/BingAutoSuggestSample.java

@@ -66,7 +66,7 @@ public static void main(String[] args) {
             //=============================================================
             // Authenticate
 
-            final String subscriptionKey = System.getenv("AZURE_BING_SAMPLES_API_KEY");
+            final String subscriptionKey = System.getenv("BING_AUTOSUGGEST_SUBSCRIPTION_KEY");
             final String customConfigId = System.getenv("AZURE_BING_SAMPLES_CUSTOM_CONFIG_ID");
 
             BingAutoSuggestSearchAPI client = BingAutoSuggestSearchManager.authenticate(subscriptionKey);