Specific error message for missplaced doc comments

Identify when documetation comments have been missplaced in the
following places:

 * After a struct element:

    ```rust
    // file.rs:
    struct X {
        a: u8 /** document a */,
    }
    ```

    ```bash
    $ rustc file.rs
    file.rs:2:11: 2:28 error: found documentation comment that doesn't
    document anything
    file.rs:2     a: u8 /** document a */,
                        ^~~~~~~~~~~~~~~~~
    file.rs:2:11: 2:28 help: doc comments must come before what they document,
    maybe a comment was intended with `//`?
    ```

 * As the last line of a struct:

    ```rust
    // file.rs:
    struct X {
        a: u8,
        /// incorrect documentation
    }
    ```

    ```bash
    $ rustc file.rs
    file.rs:3:5: 3:27 error: found a documentation comment that doesn't
    document anything
    file.rs:3     /// incorrect documentation
                  ^~~~~~~~~~~~~~~~~~~~~~
    file.rs:3:5: 3:27 help: doc comments must come before what they document,
    maybe a comment was intended with `//`?
    ```

 * As the last line of a `fn`:

    ```rust
    // file.rs:
    fn main() {
        let x = 1;
        /// incorrect documentation
    }
    ```

    ```bash
    $ rustc file.rs
    file.rs:3:5: 3:27 error: found a documentation comment that doesn't
    document anything
    file.rs:3     /// incorrect documentation
                  ^~~~~~~~~~~~~~~~~~~~~~
    file.rs:3:5: 3:27 help: doc comments must come before what they document,
    maybe a comment was intended with `//`?
    ```

Fix #27429, #30322

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