Remove now-obsolete note about location of skip_fmt

/// assert_eq!( format!("{:?}", &Wombat::default()),

///             "Wombat { visible: 0, invisible: .. }" );

/// ```

//

// This function is here in tor-bytes because crates that want to use it will largely

// be trying to avoid dumping packet data.

// But, it may at some point want to move to a lower-layer crate.

// If we do that, we should `pub use` it here, if we don't want a semver break.

pub fn skip_fmt<T>(_: &T, f: &mut fmt::Formatter) -> fmt::Result {

    /// Inner function avoids code bloat due to generics

    fn inner(f: &mut fmt::Formatter) -> fmt::Result {