Fix general typos (#852)

docs/guides/getting_started/samples/intro/structure.cs

@@ -80,7 +80,7 @@ class Program
 
     private async Task MainAsync()
     {
-        // Centralize the logic for commands into a seperate method.
+        // Centralize the logic for commands into a separate method.
         await InitCommands();
 
         // Login and connect.
@@ -138,7 +138,7 @@ class Program
             var context = new SocketCommandContext(_client, msg);
             
             // Execute the command. (result does not indicate a return value, 
-            // rather an object stating if the command executed succesfully).
+            // rather an object stating if the command executed successfully).
             var result = await _commands.ExecuteAsync(context, pos, _services);
 
             // Uncomment the following lines if you want the bot