It says built in /actions/ not built in /menu items/. These are actions, ready to be put in a menu item, rather than things you'd have to write as an external item. (I use both.)
And if you edit that file, you'll find that there are examples in it, some of which you can just uncomment if you want them.
There's a huge number of things available, and if you just dumped them all in the menu by default, it would be ugly and likely wouldn't fit on the screen well.
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