(Bloomberg) -- Airbnb Inc. boosted its annual forecast on robust bookings in the major markets in the Americas, while it posted a big jump in spending as part of an effort to diversify the business. Most Read from BloombergBillionaire Duke of Westminster to Sell £700 Million of US Real Estate AssetsUS Has Opened a Passage Through Hormuz, Central Command SaysDOJ Plans Intervention in Trump Supreme Court Carroll AppealChina Asks Banks to Pause New Loans to US-Sanctioned RefinerSony to Pay Almost $