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.