Make ^NOTE in markdown/html files bold

1992/imc/README.md

@@ -32,7 +32,7 @@ output.
 
 Of course, the source (layout) is self-documenting!  :-)
 
-NOTE: The original winning source assumed that `exit(3)` returned a value which
+**NOTE**: The original winning source assumed that `exit(3)` returned a value which
 cause problems for some systems where `exit(3)` returns a void.  The file
 [imc.c](%%REPO_URL%%/1992/imc/imc.c) has been modified to avoid this problem. The original file also
 declared argc to be a `long` which was fixed.

1992/imc/index.html

@@ -423,7 +423,7 @@ Location: <a href="../../location.html#GB">GB</a> - <em>United Kingdom of Great
 Sun raster file. Others can make use of the <code>-text</code> flag for character oriented
 output.</p>
 <p>Of course, the source (layout) is self-documenting! :-)</p>
-<p>NOTE: The original winning source assumed that <code>exit(3)</code> returned a value which
+<p><strong>NOTE</strong>: The original winning source assumed that <code>exit(3)</code> returned a value which
 cause problems for some systems where <code>exit(3)</code> returns a void. The file
 <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/imc/imc.c">imc.c</a> has been modified to avoid this problem. The original file also
 declared argc to be a <code>long</code> which was fixed.</p>