Markdown reader: don't parse links or bracketed spans as citations.

Previously pandoc would parse

    [link to (@a)](url)

as a citation; similarly

    [(@a)]{#ident}

This is undesirable.  One should be able to use example references
in citations, and even if `@a` is not defined as an example
reference, `[@a](url)` should be a link containing an author-in-text
citation rather than a normal citation followed by literal `(url)`.

Closes #7632.

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