Fix typo in ‘Introduction to IndexedDB’ article

Thanks to @hemanth for spotting and reporting this!
Convert ‘Re-introducing `<video>`’ to Markdown
Add a missing word in "(Re-)Introducing "<video>"
Convert ‘Re-introducing `<video>`’ to Markdown
Escape <video> correctly and consistently
Confict merged
Merge branch 'foolip-patch-1'
Merge branch 'patch-2' of github.com:foolip/devopera into foolip-patch-2
Inline markdown attr
Merge branch 'foolip-patch-2'