Make ^NOTE in markdown/html files bold

2001/coupard/README.md

@@ -85,7 +85,7 @@ file and saves it into `test.wav`.
 
 The output format of the program is 8KHz, unsigned 8-bit samples.
 
-NOTE: the program's return code is meaningless.
+**NOTE**: the program's return code is meaningless.
 
 
 ### Audio quality

2001/coupard/index.html

@@ -455,7 +455,7 @@ format, you can pipe it to <a href="https://en.wikipedia.org/wiki/SoX">SoX</a> f
 <p>converts the output of the program into a 44.1KHz stereo .WAV
 file and saves it into <code>test.wav</code>.</p>
 <p>The output format of the program is 8KHz, unsigned 8-bit samples.</p>
-<p>NOTE: the program’s return code is meaningless.</p>
+<p><strong>NOTE</strong>: the program’s return code is meaningless.</p>
 <h3 id="audio-quality">Audio quality</h3>
 <p>The quality of the sound produced by the program is cross between a
 <a href="https://en.wikipedia.org/wiki/Tin_can_telephone">yogurt-pot-and-string