Update toh-pt1.jade

[jan-dh]

removed closing tag

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[jan-dh]

I signed it!

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CLAs look good, thanks!

[wardbell]

Technically, the closing tag is an acceptable variant and many HTML authoring tools generate it (as happened here).

I'm removing it from this version of the doc but no promises that it will stay gone in future.

Thanks for your review though. Much appreciated.