Missing Doc comments in hover support when backticks and `doc` are intermixed

[sanbox-irl]

This bug is on current RA on current VSC on macOS.

Here's how I triggered it:

5i32.rem_euclid

and then I hovered over rem_euclid and saw this at the bottom of the tooltip (there is valid input above this)

But it didn't make sense because where is a in that example? So I dug through the docs and found the original:

        /// # Examples
        ///
        /// Basic usage:
        ///
        /// ```
        #[doc = concat!("let a: ", stringify!($SelfT), " = 7; // or any other integer type")]
        /// let b = 4;
        ///
        /// assert_eq!(a.div_euclid(b), 1); // 7 >= 4 * 1
        /// assert_eq!(a.div_euclid(-b), -1); // 7 >= -4 * -1
        /// assert_eq!((-a).div_euclid(b), -2); // -7 >= 4 * -2
        /// assert_eq!((-a).div_euclid(-b), 2); // -7 >= -4 * 2
        /// ```

I appears that doc concat is hurting the RA's ability to udnerstand. Of course, this macro is within:

impl i32 {
    int_impl! { i32, i32, u32, 32, 31, -2147483648, 2147483647, 8, "0x10000b3", "0xb301",
    "0x12345678", "0x78563412", "0x1e6a2c48", "[0x78, 0x56, 0x34, 0x12]",
    "[0x12, 0x34, 0x56, 0x78]", "", "", "" }
}

so the solution is a bit messy.

Good luck to whatever soul must figure this out

[HKalbasi]

The problem isn't mixing #[doc] and ///, as it works for me in a simpler example. The problem is the concat!, so I think we can close this as duplicate of #8092