Corrected #50 sample README

samples/50.teams-messaging-extensions-search/README.md

@@ -44,7 +44,7 @@ the Teams service needs to call into the bot.
 1) From the root of this project folder:
     - Build the sample using `mvn package`
     - Unless done previously, install the packages in the local cache by using `mvn install`
-    - Run it by using `java -jar .\target\bot-teams-message-extension-search.jar`
+    - Run it by using `java -jar .\target\bot-teams-message-extensions-search-sample.jar`
 
 
 ## Interacting with the bot