docs: add more keyboard examples for typing (#1176)
docs: add more keyboard examples for typing (#1176)

This adds more examples for using `keyboard.type` and `keyboard.press`. It adds warnings about Shift affecting or not affecting the text generated by certain methods.

fixes #723
GoogleChrome/puppeteer,GoogleChrome/puppeteer,GoogleChrome/puppeteer,puppeteer/puppeteer,brutalcrozt/puppeteer,puppeteer/puppeteer,puppeteer/puppeteer,brutalcrozt/puppeteer,puppeteer/puppeteer