fix: missing example in psbt segwit example

[karliatto]

The example cookbook/src/psbt/multiple_inputs_segwit-v0.md had some missing imports and some unnecessary ones.

[tcharding]

Thanks for the contribution! This made me wonder why it wasn't caught by CI. The reason is that the rustdoc block patched is imports only.

I believe the import block should mirror the one right at the bottom. Furthermore I think they should both be improved to be like this:

use std::collections::BTreeMap;
use std::str::FromStr;

use bitcoin::bip32::{ChildNumber, Fingerprint, IntoDerivationPath as _, Xpriv, Xpub};
use bitcoin::hashes::Hash;
use bitcoin::locktime::absolute;
use bitcoin::secp256k1::{Secp256k1, Signing};
use bitcoin::{
    consensus, psbt, transaction, Address, Amount, EcdsaSighashType, Network, OutPoint, Psbt,
    ScriptBuf, Sequence, Transaction, TxIn, TxOut, Txid, WPubkeyHash, Witness,
};

Note that this requires changing all instances of Input to psbt::Input.

[karliatto]

Sure, that makes sense. I applied the changes you suggested 8a0bf08

[tcharding]

You forgot to squash the fixup! commit mate.

[karliatto]

You forgot to squash the fixup! commit mate.

Done.

[tcharding]

ACK b369269

[tcharding]

Killed it, thanks bro.