Remove outdated note about leading `x`.
@@ -99,8 +99,6 @@ macro_rules! __diesel_column {
/// By default this allows a maximum of 32 columns per table.
/// You can increase this limit to 64 by enabling the `64-column-tables` feature.
/// You can increase it to 128 by enabling the `128-column-tables` feature.
-/// (The leading `x` is due to a bug in crates.io and will be removed in a
-/// future release)
/// You can decrease it to 16 columns,
/// which improves compilation time,
/// by disabling the default features of Diesel.
