Issue Description:

The guide states:

However, initializers do not have an identifying function name before their parentheses in the way that functions and methods do. Therefore, the names and types of an initializer’s parameters play a particularly important role in identifying which initializer should be called. Because of this, Swift provides an automatic argument label for every parameter in an initializer if you don’t provide one.

and

Note that it is not possible to call these initializers without using argument labels. Argument labels must always be used in an initializer if they are defined, and omitting them is a compile-time error:

This is needless as SE-0046 was adopted in Swift 3.0 and thus, unless explicitly stated otherwise, automatic argument labels are default everywhere. That may confuse readers who might assume that labels are not default anywhere but inside init.