Former world No. 1 Tiger Woods is confident he is returning to top form ahead of his first PGA Tour appearance of 2012 at Pebble Beach this week. The American clinched 14 majors between 1997 and 2008, but has struggled with injury over the last two years and has not won an officially sanctioned tournament since November 2009. But Woods has shown signs of improvement in recent months, winning the Chevron World Challenge event he hosts in December and finishing tied for third at last weekend's Abu Dhabi Golf Championship…