Quote long text in issues as a blockquote

Quote long text in issues as a blockquote

A long quote in an issue goes in a blockquote below its paragraph or
list. mdformat cannot wrap inline code, so a long code span stays on one
line of more than 72 characters, and the terminal UI breaks it in the
middle of the text. A blockquote inside a list item makes the whole list
loose, so the quote goes after the list.