Clarify how types are constructed from function items

[alexttx]

The section on Function Item Types (section 10.1.11 in stable branch as of Oct 26 2023) states:

When referred to, a function item, or the constructor of a tuple-like struct or enum variant, yields a zero-sized value of its function item type. That type explicitly identifies the function - its name, its type arguments, and its early-bound lifetime arguments (but not its late-bound lifetime arguments, which are only assigned when the function is called)

IMO the wording could be more explicit (and should include the return type?). Perhaps something like this:

A function item's type is defined by the function's name, the type and order of the its arguments, its return type, and its early-bound lifetime arguments. Late-bound lifetime arguments are not part of a function item's type since they are assigned when the function is called.

I'm not an expert by any means, so I don't know if the above description is correct or omits additional helpful information. For example, a statement about generics might be helpful. I presume they're not part of the type -- in which case a statement such as "Generics are not part of a function item's type since a function declared with generics is a template and not a function item - it becomes a function item when instantiated with specific types".