chore(docs): comments for page methods
chore(docs): comments for page methods

* fix: modified comment for method product, platform and newPage

* fix: added comment for browsercontext, StartCSSCoverage, StartJSCoverage

* fix: corrected comments for JSONValue, asElement, evaluateHandle

* fix: corrected comments for JSONValue, asElement, evaluateHandle

* fix: added comments for some of the method

* fix: added proper comments

* fix: added comment for some methods in page.ts

* fix: rectified the comments

* fix: changed some of the comments

* fix: added comments for 3 more methods of class page

* fix: added comments for 3 more methods of class page

Co-authored-by: Jack Franklin <993fcadce4d04090da2fefd557a0995e7966c8d5@chromium.org>
puppeteer/puppeteer,puppeteer/puppeteer,puppeteer/puppeteer,puppeteer/puppeteer