Many documentation and knowledge-base links became broken recently. It happened many times in the last few days that I searched for a topic with Google, got a hit in the Mathematica documentation, but the link turned out not to be valid any more. The same is the case with the support articles.
Google will update its database eventually, but many of these links are from Wolfram Community or Mathematica.StackExchange and it would be very valuable to keep them working. (Most old documentation links do work, but some are broken.)
Here's an example of a support article that is references many times on Mathematica.SE and now the link to it is broken:
http://webcache.googleusercontent.com/search?q=cache:BDlPC6cqIBcJ:support.wolfram.com/kb/3820+&cd=1&hl=en&ct=clnk&gl=us&client=firefox-a
This is a Google Cache link that still works today (but not for long).