Make ^NOTE in markdown/html files bold

2019/poikola/index.html

@@ -412,7 +412,7 @@ Location: <a href="../../location.html#FI">FI</a> - <em>Republic of Finland </em
 <pre><code>    make</code></pre>
 <p>There is an alternate version of this program which changes the way the output
 is displayed. See <a href="#alternate-code">Alternate code</a> below.</p>
-<p>NOTE: we disable the optimiser because the author stated that for GCC optimiser
+<p><strong>NOTE</strong>: we disable the optimiser because the author stated that for GCC optimiser
 level 0 gave correct output. With clang <code>[0123s]</code> works which suggests that [123s]
 might or might not work with GCC. Likewise, we do similar for the standard,
 forcing <code>-std=gnu11</code>.</p>