Fix markdown syntax for external links

[daniel-montalvo]

Correct parentheses for markdown link urls.

Need for Call for Review: none (this is chore more than anything else)

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[dan-tripp-siteimprove]

Maybe I'm missing something but I'm not sure why you changed this line (and the corresponding line in the spelling yaml file) from the upper case "KD" to the lower case "kd". I think that it should be upper case. The Unicode spec uses upper case. The one usage site, on line 19 of this file, uses upper case.

[dan-tripp-siteimprove]

Never mind. I looked into it for a minute and I found that no other rule uses upper case in one of these "definition IDs", or whatever we're calling them. So I assume there's a reason.

[daniel-montalvo]

@dan-tripp-siteimprove

My bad. Changes made by some local extensions have been accidentally committed here. Will restore with just the markdown fixes