units: Use singular in rustdoc

tcharding · tcharding · commit c1a760bf603e · 2025-06-12T10:44:53.000+10:00
Satoshis per virtual byte is grammatically better than satoshis per
virtual bytes - I think.
diff --git a/units/src/fee_rate/mod.rs b/units/src/fee_rate/mod.rs
@@ -62,7 +62,7 @@ impl FeeRate {
         }
     }
 
-    /// Constructs a new [`FeeRate`] from satoshis per virtual bytes,
+    /// Constructs a new [`FeeRate`] from satoshis per virtual byte,
     /// returning `None` if overflow occurred.
     pub const fn from_sat_per_vb(sat_vb: u64) -> Option<Self> {
         // No `map()` in const context.

Original file line number	Diff line number	Diff line change
`@@ -62,7 +62,7 @@ impl FeeRate {`
`62`	`62`	`}`
`63`	`63`	`}`
`64`	`64`
`65`		- /// Constructs a new [`FeeRate`] from satoshis per virtual bytes,
	`65`	+ /// Constructs a new [`FeeRate`] from satoshis per virtual byte,
`66`	`66`	/// returning `None` if overflow occurred.
`67`	`67`	`pub const fn from_sat_per_vb(sat_vb: u64) -> Option<Self> {`
`68`	`68`	// No `map()` in const context.