Merge rust-bitcoin/rust-miniscript#596: fix: Typo in descriptor docs

5983d52dc5d77e9803d717ff10a0bd6a6cd5adc1 fix: Typo in descriptor docs (Einherjar)

Pull request description:

  Fixes the `Txin` typo in the `max_weight_to_satisfy` to correct `TxIn`

  I've noticed this while browsing the docs.

ACKs for top commit:
  apoelstra:
    ACK 5983d52dc5d77e9803d717ff10a0bd6a6cd5adc1

Tree-SHA512: eafd989febfa2b982116b4eaf5275d6d8b6b799c02167a2e2323df0b8b001b5d88b76c32fc7bc60005cd07edbf38e0eb0714d9bb1d3b6bf636851001288277f0

Author: heap-coder

src/descriptor/mod.rs

@@ -319,7 +319,7 @@ impl<Pk: MiniscriptKey> Descriptor<Pk> {
     /// for i in 0..transaction.input.len() {
     ///     assert_eq!(
     ///         descriptor_for_input[i].max_weight_to_satisfy(),
-    ///         transaction.input[i].segwit_weight() - Txin::default().segwit_weight()
+    ///         transaction.input[i].segwit_weight() - TxIn::default().segwit_weight()
     ///     );
     /// }
     /// ```
@@ -330,7 +330,7 @@ impl<Pk: MiniscriptKey> Descriptor<Pk> {
     /// for i in 0..transaction.input.len() {
     ///     assert_eq!(
     ///         descriptor_for_input[i].max_weight_to_satisfy(),
-    ///         transaction.input[i].legacy_weight() - Txin::default().legacy_weight()
+    ///         transaction.input[i].legacy_weight() - TxIn::default().legacy_weight()
     ///     );
     /// }
     /// ```