Fix Markdown list formatting.

The Markdown engine used by the book can cope with a single leading space
on the list marker:

    Like this:

     * List item

    Rather than like this:

    * List item

… but it’s not the typical convention employed in the book, and moreover
the Markdown engine used for producing the error index *can’t* cope with
it (its behaviour looks like a bug, as it appears to lose one of the two
line breaks as well, but that’s immaterial here).

So, we shift to a single convention which doesn’t trigger bugs in the
Markdown renderer.

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