Make ^NOTE in markdown/html files bold

2018/bellard/index.html

@@ -419,13 +419,13 @@ code</a> below.</p>
 running the above command (<code>./prog &gt; lena.ppm</code>), open <code>lena.ppm</code> in your
 graphics viewer of choice. After that try:</p>
 <pre><code>    ./try.sh</code></pre>
-<p>NOTE: the script uses the tools <code>pngtopam(1)</code> (or <code>pngtopnm(1)</code> for older
+<p><strong>NOTE</strong>: the script uses the tools <code>pngtopam(1)</code> (or <code>pngtopnm(1)</code> for older
 versions) and <code>pnmscale</code> come from the netpbm project and <code>cjpeg(1)</code> comes from
 <code>libjpeg-turbo</code>. If you don’t have these tools already see the
 FAQ on “<a href="../../faq.html#netpbm">netpbm</a>”
 and the
 FAQ on “<a href="../../faq.html#libjpeg">libjpeg-turbo</a>”.</p>
-<p>NOTE: <a href="Lenna.png">Lenna.png</a> is from
+<p><strong>NOTE</strong>: <a href="Lenna.png">Lenna.png</a> is from
 <a href="https://upload.wikimedia.org/wikipedia/en/7/7d/Lenna_%28test_image%29.png" class="uri">https://upload.wikimedia.org/wikipedia/en/7/7d/Lenna_%28test_image%29.png</a>.</p>
 <h2 id="alternate-code">Alternate code:</h2>
 <p>The <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2018/bellard/prog.alt.c">prog.alt.c</a> is based on the author’s remarks and it should work