Rollup merge of #38568 - chris-morgan:fix-markdown-lists, r=frewsxcv

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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See https://doc.rust-lang.org/error-index.html#E0458 and https://doc.rust-lang.org/error-index.html#E0101 for the bad current rendering in the error index.

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