rustdoc thinks Deref extends to functions that use `Pin<&mut Self>`

[jnbooth]

If type A has a function with the self parameter Pin<&mut Self>, e.g. fn close(self: Pin<&mut Self>), and type B implements Deref<Target = A>, then those functions will be listed in type B's rustdoc in the "Methods from Deref<Target = A>" section. This is incorrect behavior because type B cannot access those functions through Deref.

[lolbinarycat]

probably related to the shortcut taken in #138574

fixing it properly would require much more extensive changes.