rustdoc intra links are incorrect for trait provided methods

[crumblingstatue]

/// Always make sure to implement [`req`], but you don't have to implement [`prov`].
///
/// [`req`]: Foo::req
/// [`prov`]: Foo::prov
pub trait Foo {
	/// Required
	fn req();
	/// Provided
	fn prov() {}
}

req will link to #tymethod.req, which is exists, but prov will also link to #tymethod.prov, which doesn't exist. The correct link is #method.prov.

Ref #43466

[GuillaumeGomez]

Fix done. I'll open the PR in a few hours.