doc aliases only apply to the final element of the searched path

this can cause issues if you are looking for an associated item by the alias

# repro
[search `ptr::wrapping_add`](https://doc.rust-lang.org/1.87.0/std/primitive.pointer.html?search=ptr%3A%3Awrapping_add#method.addr)

# expected result
pointer::wrapping_add is in the results

# acrual result
alias is ignored, search results only contain types with the literal string "ptr" in their name.