Restructure documentation layout

docs/guides/commands/samples/require_owner.cs

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+// (Note: This precondition is obsolete, it is recommended to use the RequireOwnerAttribute that is bundled with Discord.Commands)
+
+using Discord.Commands;
+using Discord.WebSocket;
+using System.Threading.Tasks;
+
+// Inherit from PreconditionAttribute
+public class RequireOwnerAttribute : PreconditionAttribute
+{
+    // Override the CheckPermissions method
+    public async override Task<PreconditionResult> CheckPermissions(ICommandContext context, CommandInfo command, IDependencyMap map)
+    {
+        // Get the ID of the bot's owner
+        var ownerId = (await map.Get<DiscordSocketClient>().GetApplicationInfoAsync()).Owner.Id;
+        // If this command was executed by that user, return a success
+        if (context.User.Id == ownerId)
+            return PreconditionResult.FromSuccess();
+        // Since it wasn't, fail
+        else
+            return PreconditionResult.FromError("You must be the owner of the bot to run this command.");
+    }
+}