docs(api): fix typo
docs(api): fix typo

'Than' was used in a few places instead of 'then'.
a1ph/puppeteer,elisherer/puppeteer,puppeteer/puppeteer,puppeteer/puppeteer,a1ph/puppeteer,GoogleChrome/puppeteer,GoogleChrome/puppeteer,brutalcrozt/puppeteer,elisherer/puppeteer,puppeteer/puppeteer,puppeteer/puppeteer,GoogleChrome/puppeteer,brutalcrozt/puppeteer