doc: use reST note directive
The 'NOTE: bla bla' syntax was for asciidoc and is still present in a
couple of docstrings. The docstrings will be converted to reST format
when minirst knows how to handle it.
<h3 class="changelog"><a class="title" href="{url}rev/{node|short}{sessionvars%urlparameter}">{desc|strip|firstline|escape|nonempty}<span class="logtags"> {inbranch%inbranchtag}{branches%branchtag}{tags%tagtag}</span></a></h3>
<ul class="changelog-entry">
<li class="age">{date|age} ago</li>
<li>by <span class="name">{author|obfuscate}</span> <span class="revdate">[{date|rfc822date}] rev {rev}</span></li>
<li class="description">{desc|strip|escape|addbreaks|nonempty}</li>
</ul>