[Sphinx] [Automation] Make sure Issue -> PR conversion of hyperlinks is correct

[felix91gr]

When working on #180, I found a bug in the conversion of hyperlinks from Markdown to RST.

Input

This is the original paragraph, as written in the CG Issue:

In particular, the user should only perform left shifts via the [`checked_shl`](https://doc.rust-lang.org/core/index.html?search=%22checked_shl%22) function and right shifts via the [`checked_shr`](https://doc.rust-lang.org/core/index.html?search=%22checked_shr%22) function. Both of these functions exist in [`core`](https://doc.rust-lang.org/core/index.html).

, which when reduced to a single link looks like this:

[`checked_shl`](https://doc.rust-lang.org/core/index.html?search=%22checked_shl%22)

Output

Current (incorrect)

This is what the automation currently produces:

`\ ``checked_shl`` <https://doc.rust-lang.org/core/index.html?search=%22checked_shl%22>`_ 

Expected (correct)

This is, however, what it should produce:

`checked_shl <https://doc.rust-lang.org/core/index.html?search=%22checked_shl%22>`_