docs: Use `Timeout.Infinite` instead of -1 so that intent is clearer (#1443)

samples/01_basic_ping_bot/Program.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Threading;
 using System.Threading.Tasks;
 using Discord;
 using Discord.WebSocket;
@@ -43,7 +44,7 @@ namespace _01_basic_ping_bot
             await _client.StartAsync();
 
             // Block the program until it is closed.
-            await Task.Delay(-1);
+            await Task.Delay(Timeout.Infinite);
         }
 
         private Task LogAsync(LogMessage log)

samples/02_commands_framework/Program.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Net.Http;
+using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.Extensions.DependencyInjection;
 using Discord;
@@ -45,7 +46,7 @@ namespace _02_commands_framework
                 // Here we initialize the logic required to register our commands.
                 await services.GetRequiredService<CommandHandlingService>().InitializeAsync();
 
-                await Task.Delay(-1);
+                await Task.Delay(Timeout.Infinite);
             }
         }
 

samples/03_sharded_client/Program.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Threading;
 using System.Threading.Tasks;
 using _03_sharded_client.Services;
 using Discord;
@@ -45,7 +46,7 @@ namespace _03_sharded_client
                 await client.LoginAsync(TokenType.Bot, Environment.GetEnvironmentVariable("token"));
                 await client.StartAsync();
 
-                await Task.Delay(-1);
+                await Task.Delay(Timeout.Infinite);
             }
         }