Merge rust-bitcoin/rust-bitcoin#1933: Fix links in docs

154552e334 docs: Do not link to std::option::Option (Tobin C. Harding)
24843468c3 Remove rustdocs links to serde (Tobin C. Harding)

Pull request description:

  Two minor patches to fix up docs links. These were originally done as part of #1880 but are unrelated so pushing them up separately.

ACKs for top commit:
  apoelstra:
    ACK 154552e334
  RCasatta:
    utACK 154552e334

Tree-SHA512: e45e1538c66b59d63a66898896927bb6c1336fb4c8515bb9e2204c8035870ef8e4a6fd32dfc83db2938afda67feb27c48989e382410f9e7ea7a967132941c720

bitcoin/src/psbt/map/input.rs

@@ -71,11 +71,11 @@ const PSBT_IN_PROPRIETARY: u8 = 0xFC;
 #[cfg_attr(feature = "serde", serde(crate = "actual_serde"))]
 pub struct Input {
     /// The non-witness transaction this input spends from. Should only be
-    /// [std::option::Option::Some] for inputs which spend non-segwit outputs or
+    /// `Option::Some` for inputs which spend non-segwit outputs or
     /// if it is unknown whether an input spends a segwit output.
     pub non_witness_utxo: Option<Transaction>,
     /// The transaction output this input spends from. Should only be
-    /// [std::option::Option::Some] for inputs which spend segwit outputs,
+    /// `Option::Some` for inputs which spend segwit outputs,
     /// including P2SH embedded ones.
     pub witness_utxo: Option<TxOut>,
     /// A map from public keys to their corresponding signature as would be

hashes/src/util.rs

@@ -127,7 +127,7 @@ macro_rules! engine_input_impl(
 /// You can add arbitrary doc comments or other attributes to the struct or it's field. Note that
 /// the macro already derives [`Copy`], [`Clone`], [`Eq`], [`PartialEq`],
 /// [`Hash`](core::hash::Hash), [`Ord`], [`PartialOrd`]. With the `serde` feature on, this also adds
-/// [`Serialize`](serde::Serialize) and [`Deserialize](serde::Deserialize) implementations.
+/// `Serialize` and `Deserialize` implementations.
 ///
 /// You can also define multiple newtypes within one macro call:
 ///