refactor(DurationUnit): swap definitions of Week and Weekend

- Swapped the definitions of Week and Weekend to correct documentation errors.
- Updated the comments to reflect accurate descriptions for each duration unit.
- Ensures clarity and consistency in the DurationUnit enum definitions.

Author: winromulus

src/ES.FX/Primitives/DurationUnit.cs

@@ -86,14 +86,14 @@ public enum DurationUnit
     Day,
 
     /// <summary>
-    ///     One week (7 days).
+    ///     One weekend (2 days).
     /// </summary>
-    Week,
+    Weekend,
 
     /// <summary>
-    ///     One weekend (2 days).
+    ///     One week (7 days).
     /// </summary>
-    Weekend,
+    Week,
 
     /// <summary>
     ///     One calendar month (28–31 days).