units: Use uniform whitespace in consts

diff --git a/units/src/amount/signed.rs b/units/src/amount/signed.rs
index edf87498..97810396 100644
--- a/units/src/amount/signed.rs
+++ b/units/src/amount/signed.rs
@@ -55,6 +55,7 @@ mod encapsulate {
     impl SignedAmount {
         /// The maximum value of an amount.
         pub const MAX: Self = Self(21_000_000 * 100_000_000);
+
         /// The minimum value of an amount.
         pub const MIN: Self = Self(-21_000_000 * 100_000_000);
 
@@ -103,12 +104,16 @@ use internals::const_casts;
 impl SignedAmount {
     /// The zero amount.
     pub const ZERO: Self = Self::from_sat_i32(0);
+
     /// Exactly one satoshi.
     pub const ONE_SAT: Self = Self::from_sat_i32(1);
+
     /// Exactly one bitcoin.
     pub const ONE_BTC: Self = Self::from_btc_i16(1);
+
     /// Exactly fifty bitcoin.
     pub const FIFTY_BTC: Self = Self::from_btc_i16(50);
+
     /// The maximum value allowed as an amount. Useful for sanity checking.
     pub const MAX_MONEY: Self = Self::MAX;
 
diff --git a/units/src/amount/unsigned.rs b/units/src/amount/unsigned.rs
index 1258f0ec..cf6d0adb 100644
--- a/units/src/amount/unsigned.rs
+++ b/units/src/amount/unsigned.rs
@@ -60,6 +60,7 @@ mod encapsulate {
     impl Amount {
         /// The maximum value of an amount.
         pub const MAX: Self = Self(21_000_000 * 100_000_000);
+
         /// The minimum value of an amount.
         pub const MIN: Self = Self(0);
 
@@ -105,14 +106,19 @@ pub use encapsulate::Amount;
 impl Amount {
     /// The zero amount.
     pub const ZERO: Self = Self::from_sat_u32(0);
+
     /// Exactly one satoshi.
     pub const ONE_SAT: Self = Self::from_sat_u32(1);
+
     /// Exactly one bitcoin.
     pub const ONE_BTC: Self = Self::from_btc_u16(1);
+
     /// Exactly fifty bitcoin.
     pub const FIFTY_BTC: Self = Self::from_btc_u16(50);
+
     /// The maximum value allowed as an amount. Useful for sanity checking.
     pub const MAX_MONEY: Self = Self::MAX;
+
     /// The number of bytes that an amount contributes to the size of a transaction.
     pub const SIZE: usize = 8; // Serialized length of a u64.
 
diff --git a/units/src/pow.rs b/units/src/pow.rs
index 1955ddb7..4e3974c6 100644
--- a/units/src/pow.rs
+++ b/units/src/pow.rs
@@ -134,6 +134,7 @@ pub struct Target(U256);
 impl Target {
     /// When parsing nBits, Bitcoin Core converts a negative target threshold into a target of zero.
     pub const ZERO: Self = Self(U256::ZERO);
+
     /// The maximum possible target.
     ///
     /// This value is used to calculate difficulty, which is defined as how difficult the current
diff --git a/units/src/sequence.rs b/units/src/sequence.rs
index 49b7ce07..fdb971be 100644
--- a/units/src/sequence.rs
+++ b/units/src/sequence.rs
@@ -40,15 +40,19 @@ impl Sequence {
     ///
     /// The sequence number that disables replace-by-fee, absolute lock time and relative lock time.
     pub const MAX: Self = Self(0xFFFF_FFFF);
+
     /// Zero value sequence.
     ///
     /// This sequence number enables replace-by-fee and absolute lock time.
     pub const ZERO: Self = Self(0);
+
     /// The sequence number that disables replace-by-fee, absolute lock time and relative lock time.
     pub const FINAL: Self = Self::MAX;
+
     /// The sequence number that enables absolute lock time but disables replace-by-fee
     /// and relative lock time.
     pub const ENABLE_LOCKTIME_NO_RBF: Self = Self::MIN_NO_RBF;
+
     /// The maximum sequence number that enables replace-by-fee and absolute lock time but
     /// disables relative lock time.
     ///
@@ -66,8 +70,10 @@ impl Sequence {
     ///
     /// [BIP-0125]: <https://github.com/bitcoin/bips/blob/master/bip-0125.mediawiki>
     const MIN_NO_RBF: Self = Self(0xFFFF_FFFE);
+
     /// BIP-0068 relative lock time disable flag mask.
     const LOCK_TIME_DISABLE_FLAG_MASK: u32 = 0x8000_0000;
+
     /// BIP-0068 relative lock time type flag mask.
     pub(super) const LOCK_TYPE_MASK: u32 = 0x0040_0000;