Update types.md

[roesnera]

Includes the associated types for the first() and last() fns in addition to the contains() fn.

[rustbot]

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[marioidival]

The job failed in generics/assoc_items/types.md because the trait Contains is missing the correct references to associated types in the method signatures. Specifically, it should use Self::A and Self::B, not just A and B. Here’s how to fix it:

Change the trait definition from:

trait Contains {
    // Define generic types here which methods will be able to utilize.
    type A;
    type B;

    fn contains(&self, _: &Self::A, _: &Self::B) -> bool;
    fn first(&self) -> A;
    fn last(&self) -> B;
}

to:

trait Contains {
    type A;
    type B;

    fn contains(&self, _: &Self::A, _: &Self::B) -> bool;
    fn first(&self) -> Self::A;
    fn last(&self) -> Self::B;
}

Update the method return types to Self::A and Self::B. This will resolve the usage errors for A and B in this scope. For reference, see the current code on branch ref f460725.

Apply this change in src/generics/assoc_items/types.md to fix the failing job.