Clarify token source

docs/guides/getting_started/samples/first-bot/client.cs

@@ -6,8 +6,12 @@ public async Task MainAsync()
 
 	_client.Log += Log;
 
-	// Remember to keep token private or to read it
-	// from an external source!
+	// Remember to keep token private or to read it from an 
+	// external source! In this case, we are reading the token 
+	// from an environment variable. If you do not know how to set-up
+	// environment variables, you may find more information on the 
+	// Internet or by using other methods such as reading from 
+	// a configuration.
 	await _client.LoginAsync(TokenType.Bot, Environment.GetEnvironmentVariable("DiscordToken"));
 	await _client.StartAsync();
 

docs/guides/getting_started/samples/first-bot/complete.cs

@@ -8,15 +8,11 @@ public class Program
 	public async Task MainAsync()
 	{
 		_client = new DiscordSocketClient();
-
 		_client.Log += Log;
 		_client.MessageReceived += MessageReceivedAsync;
-
-		// Remember to keep this private or to read this
-		// from an external source!
 		await _client.LoginAsync(TokenType.Bot, Environment.GetEnvironmentVariable("DiscordToken"));
 		await _client.StartAsync();
-
+		
 		// Block this task until the program is closed.
 		await Task.Delay(-1);
 	}