What search engine prioritizes links in comments or code blocks as any sort of signal?

I have no particular attachment to SO, especially after the way they handled their public drama recently.

That said I put a link to SO any time I have to look something up there and it’s not immediately obvious from the naming/docs why it does what it does. I also try to sum it up in a sentence or two if I can and if it doesn’t distract from understanding the larger goal of that section of code.