[DOCS] TODO build rule

I tried building TODO.html from TODO according to the description in
doc/src/FAQ/README, but saw the following kind of difference repeating:

@@ -24,7 +24,7 @@
<h1><a name="section_2">Administration</a></h1>

<ul>
- <li>-<em>Allow administrators to safely terminate individual sessions either</em>
+ <li>-Allow administrators to safely terminate individual sessions either
via an SQL function or SIGTERM
</li><li>Check for unreferenced table files created by transactions that were
in-progress when the server terminated abruptly

Apparently, there is a piece of code missing that adds these <em> tags around
the done items. Bruce, do you have this code, and can you add it to the README?

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