Remove Codec::builder doctest.
Doctests can only test public API, so now that the Codec is private, we can't
have a doctest.  Since this test was only a code example (no behaviour test),
there's no value in replacing it with a unit test.
@@ -42,18 +42,6 @@ pub struct Builder {
impl Codec {
/// Return a builder for constructing a [`Codec`].
- ///
- /// # Example
- /// ```
- /// # use zebra_network::protocol::codec::Codec;
- /// use zebra_network::{constants, Network};
- ///
- /// let codec = Codec::builder()
- /// .for_network(Network::Mainnet)
- /// .for_version(constants::CURRENT_VERSION)
- /// .with_max_body_len(4_000_000)
- /// .finish();
- /// ```
pub fn builder() -> Builder {
Builder {
network: Network::Mainnet,
