units: Use 100 column width in rustdoc comments

We typically use 100 column width for comments, do so but only if it
does not make the layout worse.

Author: tcharding

units/src/fee.rs

@@ -141,10 +141,9 @@ impl FeeRate {
 
     /// Checked weight multiplication.
     ///
-    /// Computes the absolute fee amount for a given [`Weight`] at this fee rate.
-    /// When the resulting fee is a non-integer amount, the amount is rounded up,
-    /// ensuring that the transaction fee is enough instead of falling short if
-    /// rounded down.
+    /// Computes the absolute fee amount for a given [`Weight`] at this fee rate. When the resulting
+    /// fee is a non-integer amount, the amount is rounded up, ensuring that the transaction fee is
+    /// enough instead of falling short if rounded down.
     ///
     /// Returns [`None`] if overflow occurred.
     #[must_use]
@@ -198,10 +197,9 @@ crate::internal_macros::impl_op_for_references! {
 impl Weight {
     /// Checked fee rate multiplication.
     ///
-    /// Computes the absolute fee amount for a given [`FeeRate`] at this weight.
-    /// When the resulting fee is a non-integer amount, the amount is rounded up,
-    /// ensuring that the transaction fee is enough instead of falling short if
-    /// rounded down.
+    /// Computes the absolute fee amount for a given [`FeeRate`] at this weight. When the resulting
+    /// fee is a non-integer amount, the amount is rounded up, ensuring that the transaction fee is
+    /// enough instead of falling short if rounded down.
     ///
     /// Returns [`None`] if overflow occurred.
     #[must_use]

units/src/fee_rate/mod.rs

@@ -12,8 +12,8 @@ use arbitrary::{Arbitrary, Unstructured};
 
 /// Represents fee rate.
 ///
-/// This is an integer newtype representing fee rate in `sat/kwu`. It provides protection against mixing
-/// up the types as well as basic formatting features.
+/// This is an integer newtype representing fee rate in `sat/kwu`. It provides protection against
+/// mixing up the types as well as basic formatting features.
 #[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
 pub struct FeeRate(u64);