fix description of waitForVisible
fix description of waitForVisible

closes #1087
monolithed/webdriverio,Risto-Stevcev/webdriverio,Pitzcarraldo/webdriverio,Risto-Stevcev/webdriverio,Pitzcarraldo/webdriverio,sebastiendavid/webdriverio,monolithed/webdriverio,testingbot/webdriverjs,testingbot/webdriverjs,sebastiendavid/webdriverio