Continue markdown numbered list by indenting

* as of 7c28e61
* https://stackoverflow.com/questions/18088955/markdown-continue-numbered-list

Start by locating the list referenced by commit 7c28e61 in the repository's Markdown or notebook content, then compare it with the linked Stack Overflow example. Done means the numbered list continues correctly when the relevant content is indented.

索引モデルが issue の本文から書いたものです。