Minor edit

src/Discord.Net.Core/API/DiscordRestApiClient.cs

@@ -432,7 +432,7 @@ namespace Discord.API
             if (relativeId != null)
                 endpoint = () => $"channels/{channelId}/messages?limit={limit}&{relativeDir}={relativeId}";
             else
-                endpoint = () =>$"channels/{channelId}/messages?limit={limit}";
+                endpoint = () => $"channels/{channelId}/messages?limit={limit}";
             return await SendAsync<IReadOnlyCollection<Message>>("GET", endpoint, ids, options: options).ConfigureAwait(false);
         }
         public async Task<Message> CreateMessageAsync(ulong channelId, CreateMessageParams args, RequestOptions options = null)