Add detail to custom method doc comment

feature/add-method-for-custom-operations-in-context

Author: roanutil

Sources/CoreDataRepository/CoreDataRepository+Custom.swift

@@ -12,6 +12,9 @@ import Foundation
 extension CoreDataRepository {
     /// Escape hatch method for performing arbitrary operations inside a 'scratchpad' `NSManagedObjectContext` where
     /// changes will be discarded if not saved.
+    ///
+    /// The caller is responsible for saving the contexts and cleaning up if needed.
+    /// All this  method provides is the contexts and mapping `Error` into ``CoreDataError``.
     public func custom<T>(
         schedule: NSManagedObjectContext.ScheduledTaskType = .enqueued,
         block: @escaping (