Standardize function doc Errors

Changed the function docs to have the same format of
///
/// # Errors
///
/// description

bitcoin/src/blockdata/script/push_bytes.rs

@@ -207,7 +207,7 @@ mod primitive {
 
         /// Try pushing a single byte.
         ///
-        /// ## Errors
+        /// # Errors
         ///
         /// This method fails if `self` would exceed the limit.
         #[allow(deprecated)]
@@ -220,7 +220,7 @@ mod primitive {
 
         /// Try appending a slice to `PushBytesBuf`
         ///
-        /// ## Errors
+        /// # Errors
         ///
         /// This method fails if `self` would exceed the limit.
         pub fn extend_from_slice(&mut self, bytes: &[u8]) -> Result<(), PushBytesError> {

bitcoin/src/psbt/mod.rs

@@ -67,7 +67,7 @@ impl Psbt {
     /// For each PSBT input that contains UTXO information `Ok` is returned containing that information.
     /// The order of returned items is same as the order of inputs.
     ///
-    /// ## Errors
+    /// # Errors
     ///
     /// The function returns error when UTXO information is not present or is invalid.
     ///
@@ -140,7 +140,7 @@ impl Psbt {
 
     /// Extracts the [`Transaction`] from a [`Psbt`] by filling in the available signature information.
     ///
-    /// ## Errors
+    /// # Errors
     ///
     /// [`ExtractTxError`] variants will contain either the [`Psbt`] itself or the [`Transaction`]
     /// that was extracted. These can be extracted from the Errors in order to recover.
@@ -151,7 +151,7 @@ impl Psbt {
 
     /// Extracts the [`Transaction`] from a [`Psbt`] by filling in the available signature information.
     ///
-    /// ## Errors
+    /// # Errors
     ///
     /// See [`extract_tx`].
     ///
@@ -703,7 +703,7 @@ impl Psbt {
     /// 'Fee' being the amount that will be paid for mining a transaction with the current inputs
     /// and outputs i.e., the difference in value of the total inputs and the total outputs.
     ///
-    /// ## Errors
+    /// # Errors
     ///
     /// - [`Error::MissingUtxo`] when UTXO information for any input is not present or is invalid.
     /// - [`Error::NegativeFee`] if calculated value is negative.

bitcoin/src/psbt/raw.rs

@@ -188,6 +188,7 @@ where
     /// Constructs a [`ProprietaryKey`] from a [`Key`].
     ///
     /// # Errors
+    ///
     /// Returns [`Error::InvalidProprietaryKey`] if `key` does not start with `0xFC` byte.
     fn try_from(key: Key) -> Result<Self, Self::Error> {
         if key.type_value != 0xFC {

bitcoin/src/taproot/merkle_branch.rs

@@ -66,6 +66,7 @@ impl TaprootMerkleBranch {
     /// Creates a merkle proof from list of hashes.
     ///
     /// # Errors
+    ///
     /// If inner proof length is more than [`TAPROOT_CONTROL_MAX_NODE_COUNT`] (128).
     #[inline]
     fn from_collection<T: AsRef<[TapNodeHash]> + Into<Vec<TapNodeHash>>>(
@@ -123,6 +124,7 @@ macro_rules! impl_try_from {
             /// Creates a merkle proof from list of hashes.
             ///
             /// # Errors
+            ///
             /// If inner proof length is more than [`TAPROOT_CONTROL_MAX_NODE_COUNT`] (128).
             #[inline]
             fn try_from(v: $from) -> Result<Self, Self::Error> {

bitcoin/src/taproot/mod.rs

@@ -429,8 +429,13 @@ impl TaprootBuilder {
         Ok(TaprootBuilder { branch: vec![Some(node)] })
     }
 
-    /// Adds a leaf script at `depth` to the builder with script version `ver`. Errors if the leaves
-    /// are not provided in DFS walk order. The depth of the root node is 0.
+    /// Adds a leaf script at `depth` to the builder with script version `ver`.
+    ///
+    /// The depth of the root node is 0.
+    ///
+    /// # Errors
+    ///
+    /// Errors if the leaves are not provided in DFS walk order.
     pub fn add_leaf_with_ver(
         self,
         depth: u8,
@@ -441,16 +446,26 @@ impl TaprootBuilder {
         self.insert(leaf, depth)
     }
 
-    /// Adds a leaf script at `depth` to the builder with default script version. Errors if the
-    /// leaves are not provided in DFS walk order. The depth of the root node is 0.
+    /// Adds a leaf script at `depth` to the builder with default script version.
+    ///
+    /// The depth of the root node is 0.
     ///
     /// See [`TaprootBuilder::add_leaf_with_ver`] for adding a leaf with specific version.
+    ///
+    /// # Errors
+    ///
+    /// Errors if the leaves are not provided in DFS walk order.
     pub fn add_leaf(self, depth: u8, script: ScriptBuf) -> Result<Self, TaprootBuilderError> {
         self.add_leaf_with_ver(depth, script, LeafVersion::TapScript)
     }
 
-    /// Adds a hidden/omitted node at `depth` to the builder. Errors if the leaves are not provided
-    /// in DFS walk order. The depth of the root node is 0.
+    /// Adds a hidden/omitted node at `depth` to the builder.
+    ///
+    /// The depth of the root node is 0.
+    ///
+    /// # Errors
+    ///
+    /// Errors if the leaves are not provided in DFS walk order.
     pub fn add_hidden_node(
         self,
         depth: u8,