PepsiCo (NASDAQ:PEP) shares got fizzy this week as earnings crushed estimates, which is good news for anyone investing in PEP stock. Source: suriyachan / Shutterstock.com Pepsi earned $2.37 billion, $1.70 per share, on revenue of $19.2 billion for the three months ending in June. Earnings were 19 cents per share ahead of estimates, and revenue…