Merge pull request #425 from NiklasVousten/conversion-doc

Changed documentation of Conversion

Resolves #424.

src/lib.rs

@@ -426,20 +426,22 @@ pub trait Conversion<V> {
     type T: ConversionFactor<V>;
 
     /// Coefficient portion of [conversion factor](https://jcgm.bipm.org/vim/en/1.24.html) for
-    /// converting the given unit to the base unit for the quantity: `(value * coefficient()) +
-    /// constant()`. Implementation should return the multiplicative identity (`Self::T::one()`) if
-    /// no coefficient exists.
+    /// converting the given unit. To convert to the base unit for the quantity use `(value +
+    /// constant()) * coefficient()`. To convert from the base unit, `(value / coefficient()) -
+    /// constant()` is used. Implementation should return the multiplicative identity
+    /// (`Self::T::one()`) if no coefficient exists.
     #[must_use = "method returns a new number and does not mutate the original value"]
     #[inline(always)]
     fn coefficient() -> Self::T {
         <Self::T as crate::num::One>::one()
     }
 
     /// Constant portion of [conversion factor](https://jcgm.bipm.org/vim/en/1.24.html) for
-    /// converting the given unit to the base unit for the quantity: `(value * coefficient()) +
-    /// constant()`. Implementation should return the additive identity (`Self::T::zero()`) if no
-    /// constant exists. See [ConstantOp](enum.ConstantOp.html) documentation for details about
-    /// parameter use to ensure the method optimizes correctly.
+    /// converting the given unit. To convert to the base unit for the quantity use `(value +
+    /// constant()) * coefficient()`. To convert from the base unit, `(value / coefficient()) -
+    /// constant()` is used. Implementation should return the additive identity (`Self::T::zero()`)
+    /// if no constant exists. See [ConstantOp](enum.ConstantOp.html) documentation for details
+    /// about parameter use to ensure the method optimizes correctly.
     #[must_use = "method returns a new number and does not mutate the original value"]
     #[inline(always)]
     #[allow(unused_variables)]