Markup in playgrounds

The playground supports an easy way to write documentation for your code. It's like comments, which we are familiar with, but the Xcode renders them nicely. Let's do it step-by-step:

1. Open a playground project
2. Open the Utilities project
3. Select the File Inspector
4. Mark the option Render Documentation
5.  You should see that //: Playground - noun: a place where people can play is converted to a good-looking text