Finish fixing html files in 2004

There is one thing brought up on GitHub that might necessitate a minor
change but that can happen later.

2004/schnitzi/index.html

@@ -411,10 +411,12 @@ Location: <a href="../../location.html#US">US</a> - <em>United States of America
 <pre><code>    make</code></pre>
 <h2 id="to-use">To use:</h2>
 <pre><code>    ./schnitzi &lt;foo | vi -n</code></pre>
+<p>where <code>foo</code> is a valid input file (see the <a href="#the-input">author’s input details</a>
+for more details).</p>
 <h2 id="try">Try:</h2>
 <pre><code>    ./try.sh</code></pre>
-<p>NOTE: if you’re one of those who don’t know how to exit <code>vi</code> :-) don’t worry as
-it will exit for you.</p>
+<p><strong>NOTE</strong>: if you’re one of those who don’t know how to exit <code>vi</code> :-) don’t worry
+as it will exit for you.</p>
 <h2 id="judges-remarks">Judges’ remarks:</h2>
 <p>This exemplifies the meaning of Visual Editor, but we don’t think
 that any benchmarking sites are going to use this to tout the