In the technical reference, demonstration GMIC Markdown code is inadvertently rendering. See, for example Tables.
A few other double-vision cases follow. I have no idea how long this has been going on. Markdown is mostly muscle memory for me now; but I did happen to look something up this morning. My first thought was that I have been putting off eye examinations way too long. 
Thanks Garry!
Fixed with:
Reference pages have been updated.
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Ah! So much better. Thank you, David. Your remarkable industry encourages me in my laziness; I can put off going to the optometrist perhaps a few weeks more.
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