Unnecessary semicolon removed (#1728)

Author: aecceyhan

docs/intro.md

@@ -29,7 +29,7 @@ using RestSharp;
 using RestSharp.Authenticators;
 
 var client = new RestClient("https://api.twitter.com/1.1") {
-    Authenticator = new HttpBasicAuthenticator("username", "password");
+    Authenticator = new HttpBasicAuthenticator("username", "password")
 };
 var request = new RestRequest("statuses/home_timeline.json");
 var response = await client.GetAsync(request, cancellationToken);