Make ^NOTE in markdown/html files bold

1991/davidguy/index.html

@@ -443,7 +443,7 @@ performs whatever byte-swapping and bit-reversal is needed (so
 that the program works even when the server and the client have
 different architectures). It buffers communication to the X
 server for efficiency.</p>
-<p>NOTE: The original source in davidguy.c used only an IP address
+<p><strong>NOTE</strong>: The original source in davidguy.c used only an IP address
 argument (assumed :0.0) and assumed the color of black
 and white.</p>
 <p>The program doesn’t require any user interaction; you can just sit