By Brenna Hughes Neghaiwi and Christian Plumb ZURICH/VIENNA (Reuters) -Fomento Economico Mexicano on Tuesday unveiled a 1.1 billion Swiss francs ($1.15 billion) cash takeover of Swiss kiosk operator Valora, but shares of the Mexican soft drink bottler and retailer fell on concerns the price was too high. The takeover offer, which Valora’s board and its largest shareholder are backing, is Femsa’s first major acquisition outside of Latin America. Femsa, whose Oxxo convenience stores are ubiquitous in Mexico, controls Coca-Cola Femsa, the world’s top bottler of Coca-Cola products, and is also the…