Update comment to include space

Jellyfin.Server.Implementations/Users/UserManager.cs

@@ -766,7 +766,7 @@ namespace Jellyfin.Server.Implementations.Users
         {
             // This is some regex that matches only on unicode "word" characters, as well as -, _ and @
             // In theory this will cut out most if not all 'control' characters which should help minimize any weirdness
-            // Usernames can contain letters (a-z + whatever else unicode is cool with), numbers (0-9), at-signs (@), dashes (-), underscores (_), apostrophes ('), and periods (.)
+            // Usernames can contain letters (a-z + whatever else unicode is cool with), numbers (0-9), at-signs (@), dashes (-), underscores (_), apostrophes ('), periods (.) and spaces ( )
             return Regex.IsMatch(name, @"^[\w\ \-'._@]*$");
         }