Make ^NOTE in markdown/html files bold

2000/primenum/README.md

@@ -20,7 +20,7 @@ For more detailed information see [2000/primenum in bugs.html](../../bugs.html#2
     echo n | ./primenum n
 ```
 
-NOTE: `n` is an integer.
+**NOTE**: `n` is an integer.
 
 
 ## Try:

2000/primenum/index.html

@@ -418,7 +418,7 @@ Location: <a href="../../location.html#US">US</a> - <em>United States of America
 <p>For more detailed information see <a href="../../bugs.html#2000_primenum">2000/primenum in bugs.html</a>.</p>
 <h2 id="to-use">To use:</h2>
 <pre><code>    echo n | ./primenum n</code></pre>
-<p>NOTE: <code>n</code> is an integer.</p>
+<p><strong>NOTE</strong>: <code>n</code> is an integer.</p>
 <h2 id="try">Try:</h2>
 <pre><code>    ./try.sh</code></pre>
 <h2 id="judges-remarks">Judges’ remarks:</h2>