I'm getting different results than you are
Oh, it's the fourth result for me
Yeah, Google Search results for MTG rules have always been a little bit screwy
You may notice that I always link to MTG Salvation. They're usually pretty up to date.
But if you don't have a site like that, the best strategy is to go through the website. magic.wizards.com -> Gameplay -> Rules and Formats
The first Google Search hit for "mtg rules" or "magic rules" (at least for me) also goes to the right place