SANFRANCISCO(Reuters)-Amazon.comIncislaunchinganewbusinessofferingloanstosomeofitsonlinesellers,amovethatcouldboostthegrowthofitsInternetmarketplacewhileexposingittopotentialcreditrisks.ThenewprogramiscalledAmazonLendingandsellersonthecompany'smarketplacehavebeensentemailsofferingloansfromAmazonCapitalServicesInc,aunitofAmazon,accordingtoamerchantwhoreceivedsuchanemailfromt...