Fix html files for 2012

2012/endoh1/README.md

@@ -16,7 +16,7 @@ section below for more details.
     ./endoh1 < file
 ```
 
-WARNING: if you're sensitive to/don't like flashing colours/text or just want to
+**WARNING**: if you're sensitive to/don't like flashing colours/text or just want to
 see what this looks like not going so fast then you might wish to try the
 [Alternate code](#alternate-code) instead.
 

2012/endoh1/index.html

@@ -418,7 +418,7 @@ judges at the time of the contest). Another version is the deobfuscated version
 provided by the author as well. See the <a href="#alternate-code">Alternate code</a>
 section below for more details.</p>
 <pre><code>    ./endoh1 &lt; file</code></pre>
-<p>WARNING: if you’re sensitive to/don’t like flashing colours/text or just want to
+<p><strong>WARNING</strong>: if you’re sensitive to/don’t like flashing colours/text or just want to
 see what this looks like not going so fast then you might wish to try the
 <a href="#alternate-code">Alternate code</a> instead.</p>
 <h2 id="try">Try:</h2>