Tutorial improvements

[mtrunkat]

• The getting started guide doesn't mention how to enqueue requests manually, I found it somewhere in the SDK docs. Maybe giving an example of enqueueing requests manually in the getting started guide would be helpful for people starting out with writing a web-scraper.
• Again about the context.enqueueRequest() function I was not sure if I can use it asynchronously or not? for example, is it ok to pass an async function to each():

subCategoriesSelector.each(async function() {
            // Suffix sub category link with a limit of 96
            var scLink = $(this).attr('href').replace('#', '?limit=96');
            //log.info(`SubCategory Link: ${scLink}`);
            await context.enqueueRequest({
                url:`${baseURL}/${scLink}`,
                userData: {
                    "label": "LIST"
                    }
                }
            );