related #22534; fixes documentation rendering of custom number literal routine declaration (#23015)

I'm not sure if this is a complete fix, as it does not match the
expected output given in the issue. The expected output given in the
issue highlights the identifier after the `'` the same color as numeric
literals (blue), and this change does not address that. I think that
would involve simplifying `nimNumberPostfix`.

However, this fixes the issue where the routine declaration was rendered
as a string.
New rendering: 
![Screenshot from 2023-11-30
22-17-17](https://github.com/nim-lang/Nim/assets/80008541/b604ce27-a4ad-496b-82c3-0b568d99a8bf)

0 files changed, 0 insertions, 0 deletions