Fix typo.

Author: stephentyrone

Sources/RealModule/Real.swift

@@ -41,7 +41,7 @@ extension Real {
 
   /// cos(x) - 1, computed in such a way as to maintain accuracy for small x.
   ///
-  /// See also ``ElementaryFunctions.expMinusOne()``.
+  /// See also ``ElementaryFunctions/expMinusOne()``.
   @_transparent
   public static func cosMinusOne(_ x: Self) -> Self {
     let sinxOver2 = sin(x/2)