Reference Guide: Code blocks chapter calls Function a code block

[Chealer]

Section Function in the Code Blocks chapter of the reference guide opens with:

The Function code block in its most common usage takes each element of a collection as the argument to the code-block logic.

The chapter's introduction defines code blocks as objects (instances). Function is an interface, not a code block. I suggest:

An object which implements Function is a code block. In its most...

By the way

I noticed a couple more issues in that chapter.

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In the Predicate section above, the first row of the first table claims a predicate...

Evaluates each element of a collection (the argument), and returns a boolean value.

This is not necessarily true. A Predicate is not necessarily used with a filter, and even if it was, not all filters have to treat each element. I suggest:

Tests an object (the argument) and returns a boolean value.

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The Function and Procedure types are complex (at least relative to Predicate). They could surely each also use at least 1 example.