Update layouts.md
Update layouts.md

replaced 'page.title' with 'page.date' in date based example headers
racypepper/jekyll-archives,jekyll/jekyll-archives,racypepper/jekyll-archives,pathawks/jekyll-archives,pathawks/jekyll-archives,racypepper/jekyll-archives,jekyll/jekyll-archives,pathawks/jekyll-archives,jekyll/jekyll-archives