Update core-data@H4-Dp2WTA6HAZiFRQdLjx.md (#6044)

* Update core-data@H4-Dp2WTA6HAZiFRQdLjx.md

* Update src/data/roadmaps/ios/content/core-data@H4-Dp2WTA6HAZiFRQdLjx.md

swapped to a video as the course wasn't free/was behind a login.

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Co-authored-by: dsh <daniel.s.holdsworth@gmail.com>

src/data/roadmaps/ios/content/core-data@H4-Dp2WTA6HAZiFRQdLjx.md

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-# Core Data
+# Core Data
+Use Core Data to save your application’s permanent data for offline use, to cache temporary data, and to add undo functionality to your app on a single device. To sync data across multiple devices in a single iCloud account, Core Data automatically mirrors your schema to a CloudKit container.
+
+Through Core Data’s Data Model editor, you define your data’s types and relationships, and generate respective class definitions. Core Data can then manage object instances at runtime to provide the following features.
+
+Visit the following resources to learn more:
+
+- [@official@CoreData](https://developer.apple.com/documentation/coredata/)
+- [@video@iOS Core Data Quick Start](https://www.youtube.com/watch?v=O7u9nYWjvKk)