Missing documentation for generics in methods

[beta-ziliani]

When looking to understand type variables in a function, for instance:

def func(x : A) forall A
end

It's intuitive to go to the Generics section. However, there isn't any mention of this in that section, and instead you need to go to Free variables. It'd be nice to add a reference.

[Blacksmoke16]

FWIW its in the Free variables section, so could at least just link to https://crystal-lang.org/reference/1.3/syntax_and_semantics/type_restrictions.html#free-variables.

[beta-ziliani]

D'oh 🤦 ! I'll edit it appropriately. Thanks!