Standardize function doc Examples

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

bitcoin/src/bip158.rs

@@ -480,6 +480,7 @@ impl<'a, R: BufRead + ?Sized> BitStreamReader<'a, R> {
     /// Reads nbit bits, returning the bits in a `u64` starting with the rightmost bit.
     ///
     /// # Examples
+    ///
     /// ```
     /// # use bitcoin::bip158::BitStreamReader;
     /// # let data = vec![0xff];

bitcoin/src/blockdata/locktime/absolute.rs

@@ -45,6 +45,7 @@ pub use units::locktime::absolute::{
 /// * [BIP-113 Median time-past as endpoint for lock-time calculations](https://github.com/bitcoin/bips/blob/master/bip-0113.mediawiki)
 ///
 /// # Examples
+///
 /// ```
 /// # use bitcoin::absolute::{LockTime, LockTime::*};
 /// # let n = LockTime::from_consensus(741521);          // n OP_CHECKLOCKTIMEVERIFY
@@ -61,6 +62,7 @@ pub enum LockTime {
     /// A block height lock time value.
     ///
     /// # Examples
+    ///
     /// ```rust
     /// use bitcoin::absolute::LockTime;
     ///
@@ -73,6 +75,7 @@ pub enum LockTime {
     /// A UNIX timestamp lock time value.
     ///
     /// # Examples
+    ///
     /// ```rust
     /// use bitcoin::absolute::LockTime;
     ///
@@ -141,6 +144,7 @@ impl LockTime {
     /// See [`LOCK_TIME_THRESHOLD`] for definition of a valid height value.
     ///
     /// # Examples
+    ///
     /// ```rust
     /// # use bitcoin::absolute::LockTime;
     /// assert!(LockTime::from_height(741521).is_ok());
@@ -157,6 +161,7 @@ impl LockTime {
     /// See [`LOCK_TIME_THRESHOLD`] for definition of a valid time value.
     ///
     /// # Examples
+    ///
     /// ```rust
     /// # use bitcoin::absolute::LockTime;
     /// assert!(LockTime::from_time(1653195600).is_ok());
@@ -196,6 +201,7 @@ impl LockTime {
     /// `height`/`time` is valid.
     ///
     /// # Examples
+    ///
     /// ```no_run
     /// # use bitcoin::absolute::{LockTime, Height, Time};
     /// // Can be implemented if block chain data is available.

bitcoin/src/crypto/key.rs

@@ -710,6 +710,7 @@ pub type UntweakedKeypair = Keypair;
 /// Tweaked BIP-340 key pair
 ///
 /// # Examples
+///
 /// ```
 /// # #[cfg(feature = "rand-std")] {
 /// # use bitcoin::key::{Keypair, TweakedKeypair, TweakedPublicKey};

internals/src/macros.rs

@@ -122,7 +122,7 @@ macro_rules! const_assert {
 ///
 /// Note: Paths are not supported (for ex. impl_from_infallible!(Hello<D: std::fmt::Display>).
 ///
-/// ## Examples
+/// # Examples
 ///
 /// ```rust
 /// # use core::fmt::{Display, Debug};

units/src/amount.rs

@@ -21,6 +21,7 @@ use internals::write_err;
 /// A set of denominations in which amounts can be expressed.
 ///
 /// # Examples
+///
 /// ```
 /// # use core::str::FromStr;
 /// # use bitcoin_units::Amount;
@@ -939,6 +940,7 @@ impl Amount {
     /// Please be aware of the risk of using floating-point numbers.
     ///
     /// # Examples
+    ///
     /// ```
     /// # use bitcoin_units::amount::{Amount, Denomination};
     /// let amount = Amount::from_sat(100_000);

units/src/locktime/absolute.rs

@@ -51,6 +51,7 @@ impl Height {
     /// If `n` does not represent a valid block height value.
     ///
     /// # Examples
+    ///
     /// ```rust
     /// use bitcoin_units::locktime::absolute::Height;
     ///
@@ -146,6 +147,7 @@ impl Time {
     /// If `n` does not encode a valid UNIX time stamp.
     ///
     /// # Examples
+    ///
     /// ```rust
     /// use bitcoin_units::locktime::absolute::Time;
     ///