Google has quietly updated their Webmaster Guidelines document, which is one of the first places webmasters should go when learning about SEO best practices and dos and don’ts.
Google updated the general guidelines section of the document, expanding on examples about how to help Google find your web pages, how to give them better ideas on what those pages are about and how to make web pages that are good for your website visitors. The quality guidelines section of the page has not been updated.
I have taken before and after screen shots of the web page so you can compare them for yourself:
Content Source: http://goo.gl/yzfEsB