Allow headers to end with a question mark
Allow headers to end with a question mark

By default, Markdown lint warns about various header-trailing
punctuation characters, including question marks:
<https://github.com/markdownlint/markdownlint/blob/master/docs/RULES.md#md007---unordered-list-indentation>.
Allowing question marks makes sense here, since the affected header is
asking a question.

ucfopen/canvasapi,ucfopen/canvasapi,ucfopen/canvasapi