Add autolinking to PEPs

[CAM-Gerlach]

In a funny coincidence, Hugo documented the shortlinks there in direct response to none other than you yourself previously pointing out they were undocumented the last time Hugo let you know about them

[META] Consider: Consolidate all Typing PEPs into a separate numbering system

TIL I’ve had a messy Javascript bookmarklet for years that zero-padded a number and constructed the canonical URL. And now it turns out there’s a shortcut URL that does that for me… Thanks, whoever added that! (It would be nice if usability features like this were publicised better, or at least documented somewhere. But I don’t want to be ungrateful - it’s quite possible that neat features like this wouldn’t exist at all if whoever added them had needed to mess around …