Adds background throughout Oct 25 (Reuters) - Hilton Worldwide Holdings HLT.N raised its full-year adjusted profit forecast on Wednesday as the hotel operator expects pent-up travel demand to boost earnings. The hotel industry, which has largely evaded the effects of elevated levels of inflation so far, continues to struggle with high wage costs in a tight labor market. Hilton, which owns brands including Waldorf Astoria Hotels & Resorts, said its third-quarter revenue per available room, a key metric, rose 6.8% from a year earlier.